message: Warn about tf-nightly conversion to TF-2.0
diff: @@ -27,11 +27,27 @@ import sys as _sys
  # pylint: disable=g-bad-import-order
  from tensorflow.python import pywrap_tensorflow # pylint: disable=unused-import
  from tensorflow.python.tools import module_util as _module_util
  +from tensorflow.python.platform import tf_logging as _logging
  # API IMPORTS PLACEHOLDER
  # WRAPPER_PLACEHOLDER
  +if "dev" in __version__: # pylint: disable=undefined-variable
  + _logging.warning("""
  +
  + TensorFlow's `tf-nightly` package will soon be updated to TensorFlow 2.0.
  +
  + Please upgrade your code to TensorFlow 2.0:
  + * https://www.tensorflow.org/beta/guide/migration_guide
  +
  + Or install the latest stable TensorFlow 1.X release:
  + * `pip install -U "tensorflow==1.*"`
  +
  + Otherwise your code may be broken by the change.
  +
  + """)
  +
  # Make sure directory containing top level submodules is in
  # the __path__ so that "from tensorflow.foo import bar" works.
  # We're using bitwise, but there's nothing special about that.
  