message: Fix estimator dependency.
  This needs to be cherry-picked to TF r1.13 branch.
diff: @@ -58,7 +58,7 @@ REQUIRED_PACKAGES = [
  'six >= 1.10.0',
  'protobuf >= 3.6.1',
  'tensorboard >= 1.12.0, < 1.13.0',
  - 'tensorflow_estimator >= 1.13.0 < 1.14.0',
  + 'tensorflow_estimator >= 1.13.0, < 1.14.0',
  'termcolor >= 1.1.0',
  ]
  