message: Add wheel dependency required for building releases
diff: @@ -91,6 +91,7 @@ dev_require = [
  "grpcio-tools==1.23.0", # Apache License 2.0
  "mypy-protobuf==1.15", # Apache License 2.0
  "twine==2.0.0", # Apache License 2.0
  + "wheel==0.33.6", # MIT
  ]
  examples_require = ["tensorflow==1.14.0"] # Apache 2.0
  