message: bazel: update remote cache docs to recommend go modules
  The remote cache requires Go modules, so enable it explicitly in the
  example.
diff: @@ -564,7 +564,8 @@ You may use any [Remote Caching](https://docs.bazel.build/versions/master/remote
  as an alternative to this.
  This requires Go 1.11+, follow the [instructions](https://golang.org/doc/install#install) to install
  -if you don't have one.
  +if you don't have one. To start the cache, run the following from the root of the Envoy repository (or anywhere else
  +that the Go toolchain can find the necessary dependencies):
  ```
  go run github.com/buchgr/bazel-remote --dir ${HOME}/bazel_cache --host 127.0.0.1 --port 28080 --max_size 64
  