old_contents: __version__ = (1, 2, 4)
  
  full_version = '.'.join(str(x) for x in __version__)
  release = full_version
  short_version = '.'.join(str(x) for x in __version__[0:3])
  
new_contents: __version__ = (1, 3, 0)
  
  full_version = '.'.join(str(x) for x in __version__)
  release = full_version
  short_version = '.'.join(str(x) for x in __version__[0:3])
  
subject: Increment version to 1.3.0