message: Update deprecation notice for 2.0
diff: @@ -50,6 +50,7 @@ WARNING: The TensorFlow contrib module will not be included in TensorFlow 2.0.
  For more information, please see:
  * https://github.com/tensorflow/community/blob/master/rfcs/20180907-contrib-sunset.md
  * https://github.com/tensorflow/addons
  + * https://github.com/tensorflow/io (for I/O related ops)
  If you depend on functionality not listed there, please file an issue.
  """
  contrib = LazyLoader('contrib', globals(), 'tensorflow.contrib',
  