old_contents: # This is the only location where the version will be written and changed.
  # Based on https://packaging.python.org/single_source_version/
  __version__ = '0.12.0b'
  
new_contents: # This is the only location where the version will be written and changed.
  # Based on https://packaging.python.org/single_source_version/
  __version__ = '0.12.0'
  
subject: Prepare update Master to 0.12.0