Change rules_cc badge to only show master branch status
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# C++ rules for Bazel
-[![Build status](https://badge.buildkite.com/f03592ae2d7d25a2abc2a2ba776e704823fa17fd3e061f5103.svg)](https://buildkite.com/bazel/rules-cc)
+[![Build status](https://badge.buildkite.com/f03592ae2d7d25a2abc2a2ba776e704823fa17fd3e061f5103.svg?branch=master](https://buildkite.com/bazel/rules-cc)
This repository contains Starlark implementation of C++ rules in Bazel.