old_contents: __version__ = '0.17.0'
  __author__ = 'meejah'
  __contact__ = 'meejah@meejah.ca'
  __url__ = 'https://github.com/meejah/txtorcon'
  __license__ = 'MIT'
  __copyright__ = 'Copyright 2012-2016'
  
new_contents: __version__ = '0.17.0'
  __author__ = 'meejah'
  __contact__ = 'meejah@meejah.ca'
  __url__ = 'https://github.com/meejah/txtorcon'
  __license__ = 'MIT'
  __copyright__ = 'Copyright 2012-2017'
  
subject: bump copyright notice