message: Fix setup.py handling of estimator nightly.
diff: @@ -108,7 +108,10 @@ if 'tf_nightly' in project_name:
  if 'tensorboard' in pkg:
  REQUIRED_PACKAGES[i] = 'tb-nightly ~= 2.4'
  elif 'tensorflow_estimator' in pkg:
  - REQUIRED_PACKAGES[i] = 'tf-estimator-nightly ~= 2.4.0'
  + # Note the .* part! TF Estimator nightly packages are not named in a way
  + # that makes `~=` syntax work so we use `==` and `.*` to pick the latest
  + # released nightly.
  + REQUIRED_PACKAGES[i] = 'tf-estimator-nightly == 2.4.0.*'
  # grpcio does not build correctly on big-endian machines due to lack of
  