message: Make grpc related tools dev requirements.
  This way they won't be installed in non-dev environments
diff: @@ -66,8 +66,6 @@ install_requires = [
  "grpcio==1.23.0", # Apache License 2.0
  "protobuf==3.9.1", # 3-Clause BSD License
  "numproto==0.2.0", # Apache License 2.0
  - "grpcio-tools==1.23.0", # Apache License 2.0
  - "mypy-protobuf==1.15", # Apache License 2.0
  "tensorflow==1.14.0", # Apache 2.0
  ]
  @@ -81,6 +79,8 @@ dev_require = [
  "isort==4.3.20", # MIT
  "rope==0.14.0", # GNU GPL
  "pip-licenses==1.15.2", # MIT License
  + "grpcio-tools==1.23.0", # Apache License 2.0
  + "mypy-protobuf==1.15", # Apache License 2.0
  ]
  tests_require = [
  