old_contents: #!/usr/bin/env python
  # This is a small utility to run maildump during development without installing it first.
  
  from maildump_runner import main
  
  if __name__ == '__main__':
      main()
new_contents: #!/usr/bin/env python
  # This is a small utility to run maildump during development without installing it first.
  
  from maildump_runner import main
  
  if __name__ == '__main__':
      main()
  
subject: Add trailing linebreak