diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go b/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go
new file mode 100644
index 0000000..e899712
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go
@@ -0,0 +1,557 @@
+// 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 impl
+
+import (
+	"fmt"
+	"reflect"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// pointerCoderFuncs is a set of pointer encoding functions.
+type pointerCoderFuncs struct {
+	mi        *MessageInfo
+	size      func(p pointer, f *coderFieldInfo, opts marshalOptions) int
+	marshal   func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error)
+	unmarshal func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error)
+	isInit    func(p pointer, f *coderFieldInfo) error
+	merge     func(dst, src pointer, f *coderFieldInfo, opts mergeOptions)
+}
+
+// valueCoderFuncs is a set of protoreflect.Value encoding functions.
+type valueCoderFuncs struct {
+	size      func(v pref.Value, tagsize int, opts marshalOptions) int
+	marshal   func(b []byte, v pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error)
+	unmarshal func(b []byte, v pref.Value, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (pref.Value, unmarshalOutput, error)
+	isInit    func(v pref.Value) error
+	merge     func(dst, src pref.Value, opts mergeOptions) pref.Value
+}
+
+// fieldCoder returns pointer functions for a field, used for operating on
+// struct fields.
+func fieldCoder(fd pref.FieldDescriptor, ft reflect.Type) (*MessageInfo, pointerCoderFuncs) {
+	switch {
+	case fd.IsMap():
+		return encoderFuncsForMap(fd, ft)
+	case fd.Cardinality() == pref.Repeated && !fd.IsPacked():
+		// Repeated fields (not packed).
+		if ft.Kind() != reflect.Slice {
+			break
+		}
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolSlice
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumSlice
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32Slice
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32Slice
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32Slice
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64Slice
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64Slice
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64Slice
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32Slice
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32Slice
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatSlice
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64Slice
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64Slice
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoubleSlice
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringSliceValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringSlice
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesSliceValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesSlice
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringSlice
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesSlice
+			}
+		case pref.MessageKind:
+			return getMessageInfo(ft), makeMessageSliceFieldCoder(fd, ft)
+		case pref.GroupKind:
+			return getMessageInfo(ft), makeGroupSliceFieldCoder(fd, ft)
+		}
+	case fd.Cardinality() == pref.Repeated && fd.IsPacked():
+		// Packed repeated fields.
+		//
+		// Only repeated fields of primitive numeric types
+		// (Varint, Fixed32, or Fixed64 wire type) can be packed.
+		if ft.Kind() != reflect.Slice {
+			break
+		}
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolPackedSlice
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumPackedSlice
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32PackedSlice
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32PackedSlice
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32PackedSlice
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64PackedSlice
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64PackedSlice
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64PackedSlice
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32PackedSlice
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32PackedSlice
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatPackedSlice
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64PackedSlice
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64PackedSlice
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoublePackedSlice
+			}
+		}
+	case fd.Kind() == pref.MessageKind:
+		return getMessageInfo(ft), makeMessageFieldCoder(fd, ft)
+	case fd.Kind() == pref.GroupKind:
+		return getMessageInfo(ft), makeGroupFieldCoder(fd, ft)
+	case fd.Syntax() == pref.Proto3 && fd.ContainingOneof() == nil:
+		// Populated oneof fields always encode even if set to the zero value,
+		// which normally are not encoded in proto3.
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolNoZero
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumNoZero
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32NoZero
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32NoZero
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32NoZero
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64NoZero
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64NoZero
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64NoZero
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32NoZero
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32NoZero
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatNoZero
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64NoZero
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64NoZero
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoubleNoZero
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringNoZeroValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringNoZero
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesNoZeroValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesNoZero
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringNoZero
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesNoZero
+			}
+		}
+	case ft.Kind() == reflect.Ptr:
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolPtr
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumPtr
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32Ptr
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32Ptr
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32Ptr
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64Ptr
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64Ptr
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64Ptr
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32Ptr
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32Ptr
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatPtr
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64Ptr
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64Ptr
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoublePtr
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringPtrValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringPtr
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringPtr
+			}
+		}
+	default:
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBool
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnum
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloat
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDouble
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderString
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytes
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderString
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytes
+			}
+		}
+	}
+	panic(fmt.Sprintf("invalid type: no encoder for %v %v %v/%v", fd.FullName(), fd.Cardinality(), fd.Kind(), ft))
+}
+
+// encoderFuncsForValue returns value functions for a field, used for
+// extension values and map encoding.
+func encoderFuncsForValue(fd pref.FieldDescriptor) valueCoderFuncs {
+	switch {
+	case fd.Cardinality() == pref.Repeated && !fd.IsPacked():
+		switch fd.Kind() {
+		case pref.BoolKind:
+			return coderBoolSliceValue
+		case pref.EnumKind:
+			return coderEnumSliceValue
+		case pref.Int32Kind:
+			return coderInt32SliceValue
+		case pref.Sint32Kind:
+			return coderSint32SliceValue
+		case pref.Uint32Kind:
+			return coderUint32SliceValue
+		case pref.Int64Kind:
+			return coderInt64SliceValue
+		case pref.Sint64Kind:
+			return coderSint64SliceValue
+		case pref.Uint64Kind:
+			return coderUint64SliceValue
+		case pref.Sfixed32Kind:
+			return coderSfixed32SliceValue
+		case pref.Fixed32Kind:
+			return coderFixed32SliceValue
+		case pref.FloatKind:
+			return coderFloatSliceValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64SliceValue
+		case pref.Fixed64Kind:
+			return coderFixed64SliceValue
+		case pref.DoubleKind:
+			return coderDoubleSliceValue
+		case pref.StringKind:
+			// We don't have a UTF-8 validating coder for repeated string fields.
+			// Value coders are used for extensions and maps.
+			// Extensions are never proto3, and maps never contain lists.
+			return coderStringSliceValue
+		case pref.BytesKind:
+			return coderBytesSliceValue
+		case pref.MessageKind:
+			return coderMessageSliceValue
+		case pref.GroupKind:
+			return coderGroupSliceValue
+		}
+	case fd.Cardinality() == pref.Repeated && fd.IsPacked():
+		switch fd.Kind() {
+		case pref.BoolKind:
+			return coderBoolPackedSliceValue
+		case pref.EnumKind:
+			return coderEnumPackedSliceValue
+		case pref.Int32Kind:
+			return coderInt32PackedSliceValue
+		case pref.Sint32Kind:
+			return coderSint32PackedSliceValue
+		case pref.Uint32Kind:
+			return coderUint32PackedSliceValue
+		case pref.Int64Kind:
+			return coderInt64PackedSliceValue
+		case pref.Sint64Kind:
+			return coderSint64PackedSliceValue
+		case pref.Uint64Kind:
+			return coderUint64PackedSliceValue
+		case pref.Sfixed32Kind:
+			return coderSfixed32PackedSliceValue
+		case pref.Fixed32Kind:
+			return coderFixed32PackedSliceValue
+		case pref.FloatKind:
+			return coderFloatPackedSliceValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64PackedSliceValue
+		case pref.Fixed64Kind:
+			return coderFixed64PackedSliceValue
+		case pref.DoubleKind:
+			return coderDoublePackedSliceValue
+		}
+	default:
+		switch fd.Kind() {
+		default:
+		case pref.BoolKind:
+			return coderBoolValue
+		case pref.EnumKind:
+			return coderEnumValue
+		case pref.Int32Kind:
+			return coderInt32Value
+		case pref.Sint32Kind:
+			return coderSint32Value
+		case pref.Uint32Kind:
+			return coderUint32Value
+		case pref.Int64Kind:
+			return coderInt64Value
+		case pref.Sint64Kind:
+			return coderSint64Value
+		case pref.Uint64Kind:
+			return coderUint64Value
+		case pref.Sfixed32Kind:
+			return coderSfixed32Value
+		case pref.Fixed32Kind:
+			return coderFixed32Value
+		case pref.FloatKind:
+			return coderFloatValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64Value
+		case pref.Fixed64Kind:
+			return coderFixed64Value
+		case pref.DoubleKind:
+			return coderDoubleValue
+		case pref.StringKind:
+			if strs.EnforceUTF8(fd) {
+				return coderStringValueValidateUTF8
+			}
+			return coderStringValue
+		case pref.BytesKind:
+			return coderBytesValue
+		case pref.MessageKind:
+			return coderMessageValue
+		case pref.GroupKind:
+			return coderGroupValue
+		}
+	}
+	panic(fmt.Sprintf("invalid field: no encoder for %v %v %v", fd.FullName(), fd.Cardinality(), fd.Kind()))
+}