old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Version info"""
  
  short_version = '0.1'
  version = '0.1.0'
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Version info"""
  
  short_version = '0.1rc0'
  version = '0.1.0rc0'
  
subject: Set version: 0.1.0rc0