Creates a new post to a channel
        :param channel_id:
        :param message:
        :return:

def post_channel(self, channel_id, message):
        """
        Creates a new post to a channel
        :param channel_id:
        :param message:
        :return:
        """
        headers = {"Authorization": "Bearer " + self.token}
        props = {'channel_id': channel_id, 'message': message}
        p = requests.post(self.url + '/posts', headers=headers, data=json.dumps(props))
        return p