def chat_post_message(self, channel, text, **params):
        """chat.postMessage

        This method posts a message to a channel.

        https://api.slack.com/methods/chat.postMessage
        """
        method = 'chat.postMessage'
        params.update({
            'channel': channel,
            'text': text,
        })
        return self._make_request(method, params)