old_contents: __version = (0, 9, 0)
  
  __version__ = version = '.'.join(map(str, __version))
  __project__ = PROJECT = __name__
  
new_contents: __version = (0, 9, 1)
  
  __version__ = version = '.'.join(map(str, __version))
  __project__ = PROJECT = __name__
  
subject: update version