Gets channels of current team

        Returns:
            list of Channel

        Throws:
            RTMServiceError when request failed

def channels(self):
        """Gets channels of current team

        Returns:
            list of Channel

        Throws:
            RTMServiceError when request failed
        """
        resp = self._rtm_client.get('v1/current_team.channels')
        if resp.is_fail():
            raise RTMServiceError(
                'Failed to get channels of current team',
                resp
            )
        return resp.data['result']