old_contents: PREVIOUS_VERSION = '0.20.1'
  
  
  def main():
      print PREVIOUS_VERSION
  
  
  if __name__ == "__main__":
      main()
  
  
new_contents: PREVIOUS_VERSION = '0.20.2'
  
  
  def main():
      print PREVIOUS_VERSION
  
  
  if __name__ == "__main__":
      main()
  
  
subject: update version [skip ci]