code: def remove(cls, user, automation, api=None):
          
          user = Transform.to_user(user)
          automation = Transform.to_automation(automation)
  
          api = api or cls._API
          api.delete(
              cls._URL['get'].format(automation_id=automation, id=user)
          )
docs: Remove a member from the automation.
          :param user: Member username
          :param automation: Automation id
          :param api: sevenbridges Api instance
          :return: None