message: Update bazel requirement
  Fixes for me
diff: @@ -4,10 +4,10 @@ This directory contains a in-developent C++ port of Minigo.
  ## Set up
  -The C++ Minigo port uses __version 0.11.1__ of the [Bazel](https://bazel.build/)
  +The C++ Minigo port uses __version 0.17.2__ of the [Bazel](https://bazel.build/)
  build system. We have experienced build issues with the latest version of Bazel,
  so for now we recommend installing
  -[bazel-0.11.1-installer-linux-x86\_64.sh](https://github.com/bazelbuild/bazel/releases).
  +[bazel-0.17.2-installer-linux-x86\_64.sh](https://github.com/bazelbuild/bazel/releases).
  Minigo++ depends on the Tensorflow C++ libraries, but we have not yet set up
  Bazel WORKSPACE and BUILD rules to automatically download and configure
  