Use vendoring for backward compatibility The switch of the Madon library to Go modules breaks builds with Go version < 1.11 since the import path now contains "v2". This patch adds vendoring so that it can still build with those versions. Let's try to re-enable Travis builds with Go v1.8-1.11...

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// Copyright 2018 The Go Authors. All rights reserved.

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// Use of this source code is governed by a BSD-style

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// license that can be found in the LICENSE file.

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// +build appengine

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package internal

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import "google.golang.org/appengine/urlfetch"

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func init() {

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	appengineClientHook = urlfetch.Client

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}