diff --git a/vendor/google.golang.org/protobuf/internal/order/order.go b/vendor/google.golang.org/protobuf/internal/order/order.go
new file mode 100644
index 0000000..2a24953
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/order/order.go
@@ -0,0 +1,89 @@
+// Copyright 2020 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 order
+
+import (
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// FieldOrder specifies the ordering to visit message fields.
+// It is a function that reports whether x is ordered before y.
+type FieldOrder func(x, y pref.FieldDescriptor) bool
+
+var (
+	// AnyFieldOrder specifies no specific field ordering.
+	AnyFieldOrder FieldOrder = nil
+
+	// LegacyFieldOrder sorts fields in the same ordering as emitted by
+	// wire serialization in the github.com/golang/protobuf implementation.
+	LegacyFieldOrder FieldOrder = func(x, y pref.FieldDescriptor) bool {
+		ox, oy := x.ContainingOneof(), y.ContainingOneof()
+		inOneof := func(od pref.OneofDescriptor) bool {
+			return od != nil && !od.IsSynthetic()
+		}
+
+		// Extension fields sort before non-extension fields.
+		if x.IsExtension() != y.IsExtension() {
+			return x.IsExtension() && !y.IsExtension()
+		}
+		// Fields not within a oneof sort before those within a oneof.
+		if inOneof(ox) != inOneof(oy) {
+			return !inOneof(ox) && inOneof(oy)
+		}
+		// Fields in disjoint oneof sets are sorted by declaration index.
+		if ox != nil && oy != nil && ox != oy {
+			return ox.Index() < oy.Index()
+		}
+		// Fields sorted by field number.
+		return x.Number() < y.Number()
+	}
+
+	// NumberFieldOrder sorts fields by their field number.
+	NumberFieldOrder FieldOrder = func(x, y pref.FieldDescriptor) bool {
+		return x.Number() < y.Number()
+	}
+
+	// IndexNameFieldOrder sorts non-extension fields before extension fields.
+	// Non-extensions are sorted according to their declaration index.
+	// Extensions are sorted according to their full name.
+	IndexNameFieldOrder FieldOrder = func(x, y pref.FieldDescriptor) bool {
+		// Non-extension fields sort before extension fields.
+		if x.IsExtension() != y.IsExtension() {
+			return !x.IsExtension() && y.IsExtension()
+		}
+		// Extensions sorted by fullname.
+		if x.IsExtension() && y.IsExtension() {
+			return x.FullName() < y.FullName()
+		}
+		// Non-extensions sorted by declaration index.
+		return x.Index() < y.Index()
+	}
+)
+
+// KeyOrder specifies the ordering to visit map entries.
+// It is a function that reports whether x is ordered before y.
+type KeyOrder func(x, y pref.MapKey) bool
+
+var (
+	// AnyKeyOrder specifies no specific key ordering.
+	AnyKeyOrder KeyOrder = nil
+
+	// GenericKeyOrder sorts false before true, numeric keys in ascending order,
+	// and strings in lexicographical ordering according to UTF-8 codepoints.
+	GenericKeyOrder KeyOrder = func(x, y pref.MapKey) bool {
+		switch x.Interface().(type) {
+		case bool:
+			return !x.Bool() && y.Bool()
+		case int32, int64:
+			return x.Int() < y.Int()
+		case uint32, uint64:
+			return x.Uint() < y.Uint()
+		case string:
+			return x.String() < y.String()
+		default:
+			panic("invalid map key type")
+		}
+	}
+)