old_contents: __version_info__ = (0, 3, 4, 1)
  __version__ = '.'.join(map(str,__version_info__))
  
new_contents: __version_info__ = (0, 4, 0, 0)
  __version__ = '.'.join(map(str,__version_info__))
  
subject: Bump version to 0.4, now with Python 3 support