message: Fix compatability with Bazel 0.27
  rules_go was too old and using deprecated features.  Upgrade it.
diff: @@ -4,8 +4,11 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
  http_archive(
  name = "io_bazel_rules_go",
  - sha256 = "492c3ac68ed9dcf527a07e6a1b2dcbf199c6bf8b35517951467ac32e421c06c1",
  - urls = ["https://github.com/bazelbuild/rules_go/releases/download/0.17.0/rules_go-0.17.0.tar.gz"],
  + urls = [
  + "https://storage.googleapis.com/bazel-mirror/github.com/bazelbuild/rules_go/releases/download/0.18.6/rules_go-0.18.6.tar.gz",
  + "https://github.com/bazelbuild/rules_go/releases/download/0.18.6/rules_go-0.18.6.tar.gz",
  + ],
  + sha256 = "f04d2373bcaf8aa09bccb08a98a57e721306c8f6043a2a0ee610fd6853dcde3d",
  )
  load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
  