message: fix add sha256sum
  Forgot to add in
diff: @@ -67,7 +67,7 @@ DEPENDENCY_REPOSITORIES = dict(
  use_category = ["build"],
  ),
  envoy_build_tools = dict(
  - sha256 = "",
  + sha256 = "e2cb99cf66e36412a9f570fe0391ff0c457ff17c2524ccdf73853c2752e8d372",
  strip_prefix = "envoy-build-tools-8d7a0cb9be7a34c726575d79688ae3dea565a424",
  # 2020-05-08
  urls = ["https://github.com/envoyproxy/envoy-build-tools/archive/8d7a0cb9be7a34c726575d79688ae3dea565a424.tar.gz"],
  