old_contents: from nbgrader.auth import JupyterHubAuthPlugin
  c = get_config()
  c.Authenticator.plugin_class = JupyterHubAuthPlugin
  
  
new_contents: from nbgrader.auth import JupyterHubAuthPlugin
  c = get_config()
  c.Exchange.path_includes_course = True
  c.Authenticator.plugin_class = JupyterHubAuthPlugin
  
subject: Include path_includes_course option