diff --git a/vendor/go.uber.org/atomic/.codecov.yml b/vendor/go.uber.org/atomic/.codecov.yml
new file mode 100644
index 0000000..571116c
--- /dev/null
+++ b/vendor/go.uber.org/atomic/.codecov.yml
@@ -0,0 +1,19 @@
+coverage:
+  range: 80..100
+  round: down
+  precision: 2
+
+  status:
+    project:                   # measuring the overall project coverage
+      default:                 # context, you can create multiple ones with custom titles
+        enabled: yes           # must be yes|true to enable this status
+        target: 100            # specify the target coverage for each commit status
+                               #   option: "auto" (must increase from parent commit or pull request base)
+                               #   option: "X%" a static target percentage to hit
+        if_not_found: success  # if parent is not found report status as success, error, or failure
+        if_ci_failed: error    # if ci fails report status as success, error, or failure
+
+# Also update COVER_IGNORE_PKGS in the Makefile.
+ignore:
+  - /internal/gen-atomicint/
+  - /internal/gen-valuewrapper/
diff --git a/vendor/go.uber.org/atomic/.gitignore b/vendor/go.uber.org/atomic/.gitignore
new file mode 100644
index 0000000..c3fa253
--- /dev/null
+++ b/vendor/go.uber.org/atomic/.gitignore
@@ -0,0 +1,12 @@
+/bin
+.DS_Store
+/vendor
+cover.html
+cover.out
+lint.log
+
+# Binaries
+*.test
+
+# Profiling output
+*.prof
diff --git a/vendor/go.uber.org/atomic/.travis.yml b/vendor/go.uber.org/atomic/.travis.yml
new file mode 100644
index 0000000..13d0a4f
--- /dev/null
+++ b/vendor/go.uber.org/atomic/.travis.yml
@@ -0,0 +1,27 @@
+sudo: false
+language: go
+go_import_path: go.uber.org/atomic
+
+env:
+  global:
+    - GO111MODULE=on
+
+matrix:
+  include:
+  - go: oldstable
+  - go: stable
+    env: LINT=1
+
+cache:
+  directories:
+    - vendor
+
+before_install:
+  - go version
+
+script:
+  - test -z "$LINT" || make lint
+  - make cover
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
diff --git a/vendor/go.uber.org/atomic/CHANGELOG.md b/vendor/go.uber.org/atomic/CHANGELOG.md
new file mode 100644
index 0000000..24c0274
--- /dev/null
+++ b/vendor/go.uber.org/atomic/CHANGELOG.md
@@ -0,0 +1,76 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.7.0] - 2020-09-14
+### Added
+- Support JSON serialization and deserialization of primitive atomic types.
+- Support Text marshalling and unmarshalling for string atomics.
+
+### Changed
+- Disallow incorrect comparison of atomic values in a non-atomic way.
+
+### Removed
+- Remove dependency on `golang.org/x/{lint, tools}`.
+
+## [1.6.0] - 2020-02-24
+### Changed
+- Drop library dependency on `golang.org/x/{lint, tools}`.
+
+## [1.5.1] - 2019-11-19
+- Fix bug where `Bool.CAS` and `Bool.Toggle` do work correctly together
+  causing `CAS` to fail even though the old value matches.
+
+## [1.5.0] - 2019-10-29
+### Changed
+- With Go modules, only the `go.uber.org/atomic` import path is supported now.
+  If you need to use the old import path, please add a `replace` directive to
+  your `go.mod`.
+
+## [1.4.0] - 2019-05-01
+### Added
+ - Add `atomic.Error` type for atomic operations on `error` values.
+
+## [1.3.2] - 2018-05-02
+### Added
+- Add `atomic.Duration` type for atomic operations on `time.Duration` values.
+
+## [1.3.1] - 2017-11-14
+### Fixed
+- Revert optimization for `atomic.String.Store("")` which caused data races.
+
+## [1.3.0] - 2017-11-13
+### Added
+- Add `atomic.Bool.CAS` for compare-and-swap semantics on bools.
+
+### Changed
+- Optimize `atomic.String.Store("")` by avoiding an allocation.
+
+## [1.2.0] - 2017-04-12
+### Added
+- Shadow `atomic.Value` from `sync/atomic`.
+
+## [1.1.0] - 2017-03-10
+### Added
+- Add atomic `Float64` type.
+
+### Changed
+- Support new `go.uber.org/atomic` import path.
+
+## [1.0.0] - 2016-07-18
+
+- Initial release.
+
+[1.7.0]: https://github.com/uber-go/atomic/compare/v1.6.0...v1.7.0
+[1.6.0]: https://github.com/uber-go/atomic/compare/v1.5.1...v1.6.0
+[1.5.1]: https://github.com/uber-go/atomic/compare/v1.5.0...v1.5.1
+[1.5.0]: https://github.com/uber-go/atomic/compare/v1.4.0...v1.5.0
+[1.4.0]: https://github.com/uber-go/atomic/compare/v1.3.2...v1.4.0
+[1.3.2]: https://github.com/uber-go/atomic/compare/v1.3.1...v1.3.2
+[1.3.1]: https://github.com/uber-go/atomic/compare/v1.3.0...v1.3.1
+[1.3.0]: https://github.com/uber-go/atomic/compare/v1.2.0...v1.3.0
+[1.2.0]: https://github.com/uber-go/atomic/compare/v1.1.0...v1.2.0
+[1.1.0]: https://github.com/uber-go/atomic/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/uber-go/atomic/releases/tag/v1.0.0
diff --git a/vendor/go.uber.org/atomic/LICENSE.txt b/vendor/go.uber.org/atomic/LICENSE.txt
new file mode 100644
index 0000000..8765c9f
--- /dev/null
+++ b/vendor/go.uber.org/atomic/LICENSE.txt
@@ -0,0 +1,19 @@
+Copyright (c) 2016 Uber Technologies, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/vendor/go.uber.org/atomic/Makefile b/vendor/go.uber.org/atomic/Makefile
new file mode 100644
index 0000000..1b1376d
--- /dev/null
+++ b/vendor/go.uber.org/atomic/Makefile
@@ -0,0 +1,78 @@
+# Directory to place `go install`ed binaries into.
+export GOBIN ?= $(shell pwd)/bin
+
+GOLINT = $(GOBIN)/golint
+GEN_ATOMICINT = $(GOBIN)/gen-atomicint
+GEN_ATOMICWRAPPER = $(GOBIN)/gen-atomicwrapper
+STATICCHECK = $(GOBIN)/staticcheck
+
+GO_FILES ?= $(shell find . '(' -path .git -o -path vendor ')' -prune -o -name '*.go' -print)
+
+# Also update ignore section in .codecov.yml.
+COVER_IGNORE_PKGS = \
+	go.uber.org/atomic/internal/gen-atomicint \
+	go.uber.org/atomic/internal/gen-atomicwrapper
+
+.PHONY: build
+build:
+	go build ./...
+
+.PHONY: test
+test:
+	go test -race ./...
+
+.PHONY: gofmt
+gofmt:
+	$(eval FMT_LOG := $(shell mktemp -t gofmt.XXXXX))
+	gofmt -e -s -l $(GO_FILES) > $(FMT_LOG) || true
+	@[ ! -s "$(FMT_LOG)" ] || (echo "gofmt failed:" && cat $(FMT_LOG) && false)
+
+$(GOLINT):
+	cd tools && go install golang.org/x/lint/golint
+
+$(STATICCHECK):
+	cd tools && go install honnef.co/go/tools/cmd/staticcheck
+
+$(GEN_ATOMICWRAPPER): $(wildcard ./internal/gen-atomicwrapper/*)
+	go build -o $@ ./internal/gen-atomicwrapper
+
+$(GEN_ATOMICINT): $(wildcard ./internal/gen-atomicint/*)
+	go build -o $@ ./internal/gen-atomicint
+
+.PHONY: golint
+golint: $(GOLINT)
+	$(GOLINT) ./...
+
+.PHONY: staticcheck
+staticcheck: $(STATICCHECK)
+	$(STATICCHECK) ./...
+
+.PHONY: lint
+lint: gofmt golint staticcheck generatenodirty
+
+# comma separated list of packages to consider for code coverage.
+COVER_PKG = $(shell \
+	go list -find ./... | \
+	grep -v $(foreach pkg,$(COVER_IGNORE_PKGS),-e "^$(pkg)$$") | \
+	paste -sd, -)
+
+.PHONY: cover
+cover:
+	go test -coverprofile=cover.out -coverpkg  $(COVER_PKG) -v ./...
+	go tool cover -html=cover.out -o cover.html
+
+.PHONY: generate
+generate: $(GEN_ATOMICINT) $(GEN_ATOMICWRAPPER)
+	go generate ./...
+
+.PHONY: generatenodirty
+generatenodirty:
+	@[ -z "$$(git status --porcelain)" ] || ( \
+		echo "Working tree is dirty. Commit your changes first."; \
+		exit 1 )
+	@make generate
+	@status=$$(git status --porcelain); \
+		[ -z "$$status" ] || ( \
+		echo "Working tree is dirty after `make generate`:"; \
+		echo "$$status"; \
+		echo "Please ensure that the generated code is up-to-date." )
diff --git a/vendor/go.uber.org/atomic/README.md b/vendor/go.uber.org/atomic/README.md
new file mode 100644
index 0000000..ade0c20
--- /dev/null
+++ b/vendor/go.uber.org/atomic/README.md
@@ -0,0 +1,63 @@
+# atomic [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![Go Report Card][reportcard-img]][reportcard]
+
+Simple wrappers for primitive types to enforce atomic access.
+
+## Installation
+
+```shell
+$ go get -u go.uber.org/atomic@v1
+```
+
+### Legacy Import Path
+
+As of v1.5.0, the import path `go.uber.org/atomic` is the only supported way
+of using this package. If you are using Go modules, this package will fail to
+compile with the legacy import path path `github.com/uber-go/atomic`.
+
+We recommend migrating your code to the new import path but if you're unable
+to do so, or if your dependencies are still using the old import path, you
+will have to add a `replace` directive to your `go.mod` file downgrading the
+legacy import path to an older version.
+
+```
+replace github.com/uber-go/atomic => github.com/uber-go/atomic v1.4.0
+```
+
+You can do so automatically by running the following command.
+
+```shell
+$ go mod edit -replace github.com/uber-go/atomic=github.com/uber-go/atomic@v1.4.0
+```
+
+## Usage
+
+The standard library's `sync/atomic` is powerful, but it's easy to forget which
+variables must be accessed atomically. `go.uber.org/atomic` preserves all the
+functionality of the standard library, but wraps the primitive types to
+provide a safer, more convenient API.
+
+```go
+var atom atomic.Uint32
+atom.Store(42)
+atom.Sub(2)
+atom.CAS(40, 11)
+```
+
+See the [documentation][doc] for a complete API specification.
+
+## Development Status
+
+Stable.
+
+---
+
+Released under the [MIT License](LICENSE.txt).
+
+[doc-img]: https://godoc.org/github.com/uber-go/atomic?status.svg
+[doc]: https://godoc.org/go.uber.org/atomic
+[ci-img]: https://travis-ci.com/uber-go/atomic.svg?branch=master
+[ci]: https://travis-ci.com/uber-go/atomic
+[cov-img]: https://codecov.io/gh/uber-go/atomic/branch/master/graph/badge.svg
+[cov]: https://codecov.io/gh/uber-go/atomic
+[reportcard-img]: https://goreportcard.com/badge/go.uber.org/atomic
+[reportcard]: https://goreportcard.com/report/go.uber.org/atomic
diff --git a/vendor/go.uber.org/atomic/bool.go b/vendor/go.uber.org/atomic/bool.go
new file mode 100644
index 0000000..9cf1914
--- /dev/null
+++ b/vendor/go.uber.org/atomic/bool.go
@@ -0,0 +1,81 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+)
+
+// Bool is an atomic type-safe wrapper for bool values.
+type Bool struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Uint32
+}
+
+var _zeroBool bool
+
+// NewBool creates a new Bool.
+func NewBool(v bool) *Bool {
+	x := &Bool{}
+	if v != _zeroBool {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped bool.
+func (x *Bool) Load() bool {
+	return truthy(x.v.Load())
+}
+
+// Store atomically stores the passed bool.
+func (x *Bool) Store(v bool) {
+	x.v.Store(boolToInt(v))
+}
+
+// CAS is an atomic compare-and-swap for bool values.
+func (x *Bool) CAS(o, n bool) bool {
+	return x.v.CAS(boolToInt(o), boolToInt(n))
+}
+
+// Swap atomically stores the given bool and returns the old
+// value.
+func (x *Bool) Swap(o bool) bool {
+	return truthy(x.v.Swap(boolToInt(o)))
+}
+
+// MarshalJSON encodes the wrapped bool into JSON.
+func (x *Bool) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a bool from JSON.
+func (x *Bool) UnmarshalJSON(b []byte) error {
+	var v bool
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/bool_ext.go b/vendor/go.uber.org/atomic/bool_ext.go
new file mode 100644
index 0000000..c7bf7a8
--- /dev/null
+++ b/vendor/go.uber.org/atomic/bool_ext.go
@@ -0,0 +1,53 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"strconv"
+)
+
+//go:generate bin/gen-atomicwrapper -name=Bool -type=bool -wrapped=Uint32 -pack=boolToInt -unpack=truthy -cas -swap -json -file=bool.go
+
+func truthy(n uint32) bool {
+	return n == 1
+}
+
+func boolToInt(b bool) uint32 {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+// Toggle atomically negates the Boolean and returns the previous value.
+func (b *Bool) Toggle() bool {
+	for {
+		old := b.Load()
+		if b.CAS(old, !old) {
+			return old
+		}
+	}
+}
+
+// String encodes the wrapped value as a string.
+func (b *Bool) String() string {
+	return strconv.FormatBool(b.Load())
+}
diff --git a/vendor/go.uber.org/atomic/doc.go b/vendor/go.uber.org/atomic/doc.go
new file mode 100644
index 0000000..ae7390e
--- /dev/null
+++ b/vendor/go.uber.org/atomic/doc.go
@@ -0,0 +1,23 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// Package atomic provides simple wrappers around numerics to enforce atomic
+// access.
+package atomic
diff --git a/vendor/go.uber.org/atomic/duration.go b/vendor/go.uber.org/atomic/duration.go
new file mode 100644
index 0000000..027cfcb
--- /dev/null
+++ b/vendor/go.uber.org/atomic/duration.go
@@ -0,0 +1,82 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"time"
+)
+
+// Duration is an atomic type-safe wrapper for time.Duration values.
+type Duration struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Int64
+}
+
+var _zeroDuration time.Duration
+
+// NewDuration creates a new Duration.
+func NewDuration(v time.Duration) *Duration {
+	x := &Duration{}
+	if v != _zeroDuration {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped time.Duration.
+func (x *Duration) Load() time.Duration {
+	return time.Duration(x.v.Load())
+}
+
+// Store atomically stores the passed time.Duration.
+func (x *Duration) Store(v time.Duration) {
+	x.v.Store(int64(v))
+}
+
+// CAS is an atomic compare-and-swap for time.Duration values.
+func (x *Duration) CAS(o, n time.Duration) bool {
+	return x.v.CAS(int64(o), int64(n))
+}
+
+// Swap atomically stores the given time.Duration and returns the old
+// value.
+func (x *Duration) Swap(o time.Duration) time.Duration {
+	return time.Duration(x.v.Swap(int64(o)))
+}
+
+// MarshalJSON encodes the wrapped time.Duration into JSON.
+func (x *Duration) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a time.Duration from JSON.
+func (x *Duration) UnmarshalJSON(b []byte) error {
+	var v time.Duration
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/duration_ext.go b/vendor/go.uber.org/atomic/duration_ext.go
new file mode 100644
index 0000000..6273b66
--- /dev/null
+++ b/vendor/go.uber.org/atomic/duration_ext.go
@@ -0,0 +1,40 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import "time"
+
+//go:generate bin/gen-atomicwrapper -name=Duration -type=time.Duration -wrapped=Int64 -pack=int64 -unpack=time.Duration -cas -swap -json -imports time -file=duration.go
+
+// Add atomically adds to the wrapped time.Duration and returns the new value.
+func (d *Duration) Add(n time.Duration) time.Duration {
+	return time.Duration(d.v.Add(int64(n)))
+}
+
+// Sub atomically subtracts from the wrapped time.Duration and returns the new value.
+func (d *Duration) Sub(n time.Duration) time.Duration {
+	return time.Duration(d.v.Sub(int64(n)))
+}
+
+// String encodes the wrapped value as a string.
+func (d *Duration) String() string {
+	return d.Load().String()
+}
diff --git a/vendor/go.uber.org/atomic/error.go b/vendor/go.uber.org/atomic/error.go
new file mode 100644
index 0000000..a6166fb
--- /dev/null
+++ b/vendor/go.uber.org/atomic/error.go
@@ -0,0 +1,51 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+// Error is an atomic type-safe wrapper for error values.
+type Error struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Value
+}
+
+var _zeroError error
+
+// NewError creates a new Error.
+func NewError(v error) *Error {
+	x := &Error{}
+	if v != _zeroError {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped error.
+func (x *Error) Load() error {
+	return unpackError(x.v.Load())
+}
+
+// Store atomically stores the passed error.
+func (x *Error) Store(v error) {
+	x.v.Store(packError(v))
+}
diff --git a/vendor/go.uber.org/atomic/error_ext.go b/vendor/go.uber.org/atomic/error_ext.go
new file mode 100644
index 0000000..ffe0be2
--- /dev/null
+++ b/vendor/go.uber.org/atomic/error_ext.go
@@ -0,0 +1,39 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+// atomic.Value panics on nil inputs, or if the underlying type changes.
+// Stabilize by always storing a custom struct that we control.
+
+//go:generate bin/gen-atomicwrapper -name=Error -type=error -wrapped=Value -pack=packError -unpack=unpackError -file=error.go
+
+type packedError struct{ Value error }
+
+func packError(v error) interface{} {
+	return packedError{v}
+}
+
+func unpackError(v interface{}) error {
+	if err, ok := v.(packedError); ok {
+		return err.Value
+	}
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/float64.go b/vendor/go.uber.org/atomic/float64.go
new file mode 100644
index 0000000..0719060
--- /dev/null
+++ b/vendor/go.uber.org/atomic/float64.go
@@ -0,0 +1,76 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"math"
+)
+
+// Float64 is an atomic type-safe wrapper for float64 values.
+type Float64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Uint64
+}
+
+var _zeroFloat64 float64
+
+// NewFloat64 creates a new Float64.
+func NewFloat64(v float64) *Float64 {
+	x := &Float64{}
+	if v != _zeroFloat64 {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped float64.
+func (x *Float64) Load() float64 {
+	return math.Float64frombits(x.v.Load())
+}
+
+// Store atomically stores the passed float64.
+func (x *Float64) Store(v float64) {
+	x.v.Store(math.Float64bits(v))
+}
+
+// CAS is an atomic compare-and-swap for float64 values.
+func (x *Float64) CAS(o, n float64) bool {
+	return x.v.CAS(math.Float64bits(o), math.Float64bits(n))
+}
+
+// MarshalJSON encodes the wrapped float64 into JSON.
+func (x *Float64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a float64 from JSON.
+func (x *Float64) UnmarshalJSON(b []byte) error {
+	var v float64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/float64_ext.go b/vendor/go.uber.org/atomic/float64_ext.go
new file mode 100644
index 0000000..927b1ad
--- /dev/null
+++ b/vendor/go.uber.org/atomic/float64_ext.go
@@ -0,0 +1,47 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import "strconv"
+
+//go:generate bin/gen-atomicwrapper -name=Float64 -type=float64 -wrapped=Uint64 -pack=math.Float64bits -unpack=math.Float64frombits -cas -json -imports math -file=float64.go
+
+// Add atomically adds to the wrapped float64 and returns the new value.
+func (f *Float64) Add(s float64) float64 {
+	for {
+		old := f.Load()
+		new := old + s
+		if f.CAS(old, new) {
+			return new
+		}
+	}
+}
+
+// Sub atomically subtracts from the wrapped float64 and returns the new value.
+func (f *Float64) Sub(s float64) float64 {
+	return f.Add(-s)
+}
+
+// String encodes the wrapped value as a string.
+func (f *Float64) String() string {
+	// 'g' is the behavior for floats with %v.
+	return strconv.FormatFloat(f.Load(), 'g', -1, 64)
+}
diff --git a/vendor/go.uber.org/atomic/gen.go b/vendor/go.uber.org/atomic/gen.go
new file mode 100644
index 0000000..50d6b24
--- /dev/null
+++ b/vendor/go.uber.org/atomic/gen.go
@@ -0,0 +1,26 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+//go:generate bin/gen-atomicint -name=Int32 -wrapped=int32 -file=int32.go
+//go:generate bin/gen-atomicint -name=Int64 -wrapped=int64 -file=int64.go
+//go:generate bin/gen-atomicint -name=Uint32 -wrapped=uint32 -unsigned -file=uint32.go
+//go:generate bin/gen-atomicint -name=Uint64 -wrapped=uint64 -unsigned -file=uint64.go
diff --git a/vendor/go.uber.org/atomic/go.mod b/vendor/go.uber.org/atomic/go.mod
new file mode 100644
index 0000000..daa7599
--- /dev/null
+++ b/vendor/go.uber.org/atomic/go.mod
@@ -0,0 +1,8 @@
+module go.uber.org/atomic
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/stretchr/testify v1.3.0
+)
+
+go 1.13
diff --git a/vendor/go.uber.org/atomic/go.sum b/vendor/go.uber.org/atomic/go.sum
new file mode 100644
index 0000000..4f76e62
--- /dev/null
+++ b/vendor/go.uber.org/atomic/go.sum
@@ -0,0 +1,9 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
diff --git a/vendor/go.uber.org/atomic/int32.go b/vendor/go.uber.org/atomic/int32.go
new file mode 100644
index 0000000..18ae564
--- /dev/null
+++ b/vendor/go.uber.org/atomic/int32.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int32 is an atomic wrapper around int32.
+type Int32 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v int32
+}
+
+// NewInt32 creates a new Int32.
+func NewInt32(i int32) *Int32 {
+	return &Int32{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int32) Load() int32 {
+	return atomic.LoadInt32(&i.v)
+}
+
+// Add atomically adds to the wrapped int32 and returns the new value.
+func (i *Int32) Add(n int32) int32 {
+	return atomic.AddInt32(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped int32 and returns the new value.
+func (i *Int32) Sub(n int32) int32 {
+	return atomic.AddInt32(&i.v, -n)
+}
+
+// Inc atomically increments the wrapped int32 and returns the new value.
+func (i *Int32) Inc() int32 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int32 and returns the new value.
+func (i *Int32) Dec() int32 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Int32) CAS(old, new int32) bool {
+	return atomic.CompareAndSwapInt32(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int32) Store(n int32) {
+	atomic.StoreInt32(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped int32 and returns the old value.
+func (i *Int32) Swap(n int32) int32 {
+	return atomic.SwapInt32(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped int32 into JSON.
+func (i *Int32) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int32.
+func (i *Int32) UnmarshalJSON(b []byte) error {
+	var v int32
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int32) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/int64.go b/vendor/go.uber.org/atomic/int64.go
new file mode 100644
index 0000000..2bcbbfa
--- /dev/null
+++ b/vendor/go.uber.org/atomic/int64.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int64 is an atomic wrapper around int64.
+type Int64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v int64
+}
+
+// NewInt64 creates a new Int64.
+func NewInt64(i int64) *Int64 {
+	return &Int64{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int64) Load() int64 {
+	return atomic.LoadInt64(&i.v)
+}
+
+// Add atomically adds to the wrapped int64 and returns the new value.
+func (i *Int64) Add(n int64) int64 {
+	return atomic.AddInt64(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped int64 and returns the new value.
+func (i *Int64) Sub(n int64) int64 {
+	return atomic.AddInt64(&i.v, -n)
+}
+
+// Inc atomically increments the wrapped int64 and returns the new value.
+func (i *Int64) Inc() int64 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int64 and returns the new value.
+func (i *Int64) Dec() int64 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Int64) CAS(old, new int64) bool {
+	return atomic.CompareAndSwapInt64(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int64) Store(n int64) {
+	atomic.StoreInt64(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped int64 and returns the old value.
+func (i *Int64) Swap(n int64) int64 {
+	return atomic.SwapInt64(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped int64 into JSON.
+func (i *Int64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int64.
+func (i *Int64) UnmarshalJSON(b []byte) error {
+	var v int64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int64) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/nocmp.go b/vendor/go.uber.org/atomic/nocmp.go
new file mode 100644
index 0000000..a8201cb
--- /dev/null
+++ b/vendor/go.uber.org/atomic/nocmp.go
@@ -0,0 +1,35 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+// nocmp is an uncomparable struct. Embed this inside another struct to make
+// it uncomparable.
+//
+//  type Foo struct {
+//    nocmp
+//    // ...
+//  }
+//
+// This DOES NOT:
+//
+//  - Disallow shallow copies of structs
+//  - Disallow comparison of pointers to uncomparable structs
+type nocmp [0]func()
diff --git a/vendor/go.uber.org/atomic/string.go b/vendor/go.uber.org/atomic/string.go
new file mode 100644
index 0000000..225b7a2
--- /dev/null
+++ b/vendor/go.uber.org/atomic/string.go
@@ -0,0 +1,54 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+// String is an atomic type-safe wrapper for string values.
+type String struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Value
+}
+
+var _zeroString string
+
+// NewString creates a new String.
+func NewString(v string) *String {
+	x := &String{}
+	if v != _zeroString {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped string.
+func (x *String) Load() string {
+	if v := x.v.Load(); v != nil {
+		return v.(string)
+	}
+	return _zeroString
+}
+
+// Store atomically stores the passed string.
+func (x *String) Store(v string) {
+	x.v.Store(v)
+}
diff --git a/vendor/go.uber.org/atomic/string_ext.go b/vendor/go.uber.org/atomic/string_ext.go
new file mode 100644
index 0000000..3a95582
--- /dev/null
+++ b/vendor/go.uber.org/atomic/string_ext.go
@@ -0,0 +1,43 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+//go:generate bin/gen-atomicwrapper -name=String -type=string -wrapped=Value -file=string.go
+
+// String returns the wrapped value.
+func (s *String) String() string {
+	return s.Load()
+}
+
+// MarshalText encodes the wrapped string into a textual form.
+//
+// This makes it encodable as JSON, YAML, XML, and more.
+func (s *String) MarshalText() ([]byte, error) {
+	return []byte(s.Load()), nil
+}
+
+// UnmarshalText decodes text and replaces the wrapped string with it.
+//
+// This makes it decodable from JSON, YAML, XML, and more.
+func (s *String) UnmarshalText(b []byte) error {
+	s.Store(string(b))
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/uint32.go b/vendor/go.uber.org/atomic/uint32.go
new file mode 100644
index 0000000..a973aba
--- /dev/null
+++ b/vendor/go.uber.org/atomic/uint32.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Uint32 is an atomic wrapper around uint32.
+type Uint32 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v uint32
+}
+
+// NewUint32 creates a new Uint32.
+func NewUint32(i uint32) *Uint32 {
+	return &Uint32{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Uint32) Load() uint32 {
+	return atomic.LoadUint32(&i.v)
+}
+
+// Add atomically adds to the wrapped uint32 and returns the new value.
+func (i *Uint32) Add(n uint32) uint32 {
+	return atomic.AddUint32(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped uint32 and returns the new value.
+func (i *Uint32) Sub(n uint32) uint32 {
+	return atomic.AddUint32(&i.v, ^(n - 1))
+}
+
+// Inc atomically increments the wrapped uint32 and returns the new value.
+func (i *Uint32) Inc() uint32 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped uint32 and returns the new value.
+func (i *Uint32) Dec() uint32 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Uint32) CAS(old, new uint32) bool {
+	return atomic.CompareAndSwapUint32(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Uint32) Store(n uint32) {
+	atomic.StoreUint32(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped uint32 and returns the old value.
+func (i *Uint32) Swap(n uint32) uint32 {
+	return atomic.SwapUint32(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped uint32 into JSON.
+func (i *Uint32) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped uint32.
+func (i *Uint32) UnmarshalJSON(b []byte) error {
+	var v uint32
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Uint32) String() string {
+	v := i.Load()
+	return strconv.FormatUint(uint64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/uint64.go b/vendor/go.uber.org/atomic/uint64.go
new file mode 100644
index 0000000..3b6c71f
--- /dev/null
+++ b/vendor/go.uber.org/atomic/uint64.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Uint64 is an atomic wrapper around uint64.
+type Uint64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v uint64
+}
+
+// NewUint64 creates a new Uint64.
+func NewUint64(i uint64) *Uint64 {
+	return &Uint64{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Uint64) Load() uint64 {
+	return atomic.LoadUint64(&i.v)
+}
+
+// Add atomically adds to the wrapped uint64 and returns the new value.
+func (i *Uint64) Add(n uint64) uint64 {
+	return atomic.AddUint64(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped uint64 and returns the new value.
+func (i *Uint64) Sub(n uint64) uint64 {
+	return atomic.AddUint64(&i.v, ^(n - 1))
+}
+
+// Inc atomically increments the wrapped uint64 and returns the new value.
+func (i *Uint64) Inc() uint64 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped uint64 and returns the new value.
+func (i *Uint64) Dec() uint64 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Uint64) CAS(old, new uint64) bool {
+	return atomic.CompareAndSwapUint64(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Uint64) Store(n uint64) {
+	atomic.StoreUint64(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped uint64 and returns the old value.
+func (i *Uint64) Swap(n uint64) uint64 {
+	return atomic.SwapUint64(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped uint64 into JSON.
+func (i *Uint64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped uint64.
+func (i *Uint64) UnmarshalJSON(b []byte) error {
+	var v uint64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Uint64) String() string {
+	v := i.Load()
+	return strconv.FormatUint(uint64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/value.go b/vendor/go.uber.org/atomic/value.go
new file mode 100644
index 0000000..671f3a3
--- /dev/null
+++ b/vendor/go.uber.org/atomic/value.go
@@ -0,0 +1,31 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+import "sync/atomic"
+
+// Value shadows the type of the same name from sync/atomic
+// https://godoc.org/sync/atomic#Value
+type Value struct {
+	atomic.Value
+
+	_ nocmp // disallow non-atomic comparison
+}