old_contents: #!flask/bin/python
  from app.application import app
  app.run(debug=True)
  
new_contents: #!flask/bin/python
  from app.application import app
  import os
  PORT = os.environ.get('port', 5000)
  app.run(debug=True, host='0.0.0.0', port=PORT)
  
subject: Fix run command