message: Fix URLs for protobuf 3.6.1.2
diff: @@ -347,8 +347,8 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
  )
  PROTOBUF_URLS = [
  - "https://mirror.bazel.build/github.com/google/protobuf/archive/v3.6.1.2.tar.gz",
  - "https://github.com/google/protobuf/archive/v3.6.1.2.tar.gz",
  + "https://mirror.bazel.build/github.com/protocolbuffers/protobuf/archive/v3.6.1.2.tar.gz",
  + "https://github.com/protocolbuffers/protobuf/archive/v3.6.1.2.tar.gz",
  ]
  PROTOBUF_SHA256 = "2244b0308846bb22b4ff0bcc675e99290ff9f1115553ae9671eba1030af31bc0"
  PROTOBUF_STRIP_PREFIX = "protobuf-3.6.1.2"
  