message: Fixing typo for estimator
diff: @@ -101,7 +101,7 @@ REQUIRED_PACKAGES = [
  # They are updated during the release process
  # When updating these, please also update the nightly versions below
  'tensorboard ~= 2.4',
  - 'tf-estimator >= 2.5.0rc0 , < 2.6.0',
  + 'tensorflow-estimator >= 2.5.0rc0 , < 2.6.0',
  # TODO(scottzhu): OSS keras hasn't been formally released yet.
  # Use keras-nightly at the moment.
  'keras-nightly ~= 2.5.0.dev',
  