gRPC migration update

Change-Id: Icdd1a824948fa994cd36bd121c962f5ecf74e3cf
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/doc.go b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
new file mode 100644
index 0000000..162b4f9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
@@ -0,0 +1,7 @@
+// 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 prototext marshals and unmarshals protocol buffer messages as the
+// textproto format.
+package prototext