old_contents: __title__ = 'pypaystack'
  __version__ = '1.20'
  __author__ = 'Edward Popoola'
  __license__ = 'MIT'
  __copyright__ = 'Copyright 2016. Edward Popoola'
  
new_contents: __title__ = 'pypaystack'
  __version__ = '1.21'
  __author__ = 'Edward Popoola'
  __license__ = 'MIT'
  __copyright__ = 'Copyright 2016. Edward Popoola'
  
subject: Add transfers to transaction