old_contents: from __future__ import unicode_literals
  from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  
  __version__ = '0.9.0a2'
  
new_contents: from __future__ import unicode_literals
  from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  
  __version__ = '0.9.0a3'
  
subject: Update version.py