Add a jenkins test status badge.
[ci skip]
Change-Id: I5bf4f204e7ef0144d8fc984a985d502f92ce95ce
diff --git a/README.md b/README.md
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+++ b/README.md
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Protocol Buffers - Google's data interchange format
===================================================
-[](https://travis-ci.org/google/protobuf) [](https://ci.appveyor.com/project/protobuf/protobuf)
+[](https://travis-ci.org/google/protobuf) [](https://ci.appveyor.com/project/protobuf/protobuf) [](https://grpc-testing.appspot.com/job/protobuf_branch)
Copyright 2008 Google Inc.