Fix dependencies

vendor/google.golang.org/protobuf/encoding/prototext/doc.go

@@ -1,7 +0,0 @@
-// 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