diff --git a/vendor/google.golang.org/protobuf/internal/version/version.go b/vendor/google.golang.org/protobuf/internal/version/version.go
new file mode 100644
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+++ b/vendor/google.golang.org/protobuf/internal/version/version.go
@@ -0,0 +1,79 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package version records versioning information about this module.
+package version
+
+import (
+	"fmt"
+	"strings"
+)
+
+// These constants determine the current version of this module.
+//
+//
+// For our release process, we enforce the following rules:
+//	* Tagged releases use a tag that is identical to String.
+//	* Tagged releases never reference a commit where the String
+//	contains "devel".
+//	* The set of all commits in this repository where String
+//	does not contain "devel" must have a unique String.
+//
+//
+// Steps for tagging a new release:
+//	1. Create a new CL.
+//
+//	2. Update Minor, Patch, and/or PreRelease as necessary.
+//	PreRelease must not contain the string "devel".
+//
+//	3. Since the last released minor version, have there been any changes to
+//	generator that relies on new functionality in the runtime?
+//	If yes, then increment RequiredGenerated.
+//
+//	4. Since the last released minor version, have there been any changes to
+//	the runtime that removes support for old .pb.go source code?
+//	If yes, then increment SupportMinimum.
+//
+//	5. Send out the CL for review and submit it.
+//	Note that the next CL in step 8 must be submitted after this CL
+//	without any other CLs in-between.
+//
+//	6. Tag a new version, where the tag is is the current String.
+//
+//	7. Write release notes for all notable changes
+//	between this release and the last release.
+//
+//	8. Create a new CL.
+//
+//	9. Update PreRelease to include the string "devel".
+//	For example: "" -> "devel" or "rc.1" -> "rc.1.devel"
+//
+//	10. Send out the CL for review and submit it.
+const (
+	Major      = 1
+	Minor      = 27
+	Patch      = 1
+	PreRelease = ""
+)
+
+// String formats the version string for this module in semver format.
+//
+// Examples:
+//	v1.20.1
+//	v1.21.0-rc.1
+func String() string {
+	v := fmt.Sprintf("v%d.%d.%d", Major, Minor, Patch)
+	if PreRelease != "" {
+		v += "-" + PreRelease
+
+		// TODO: Add metadata about the commit or build hash.
+		// See https://golang.org/issue/29814
+		// See https://golang.org/issue/33533
+		var metadata string
+		if strings.Contains(PreRelease, "devel") && metadata != "" {
+			v += "+" + metadata
+		}
+	}
+	return v
+}