def publish(self, channel_id):
        """ publish: publishes tree to Kolibri
            Args:
                channel_id (str): channel's id on Kolibri Studio
            Returns: None
        """
        payload = {
            "channel_id":channel_id,
        }
        response = config.SESSION.post(config.publish_channel_url(), data=json.dumps(payload))
        response.raise_for_status()