Send a reply using RTM API

            (This function doesn't supports formatted message
            when using a bot integration)

def send(self, text, thread_ts=None):
        """
            Send a reply using RTM API

            (This function doesn't supports formatted message
            when using a bot integration)
        """
        self._client.rtm_send_message(self._body['channel'], text, thread_ts=thread_ts)