message: Bump the version string to v0.12.0
  Bump the versio string to v0.12.0
diff: # ==============================================================================
  """version_ops"""
  -package = 'tensorflow==2.1.0'
  -version = '0.11.0'
  +package = 'tensorflow>=2.1.0,<2.2.0'
  +version = '0.12.0'
  