docs: async def _update_config(self):
          """Update configuration data if required.
  
          Notes:
            Per `the documentation`_, this updates the API configuration
            data *"every few days"*.
  
          .. _the documentation:
            http://docs.themoviedb.apiary.io/#reference/configuration
  
          """
          if self.config['data'] is None or self.config_expired:
              data = await self.get_data(self.url_builder('configuration'))
              self.config = dict(data=data, last_update=datetime.now())