See: https://core.telegram.org/bots/api#pinchatmessage

async def pinChatMessage(self, chat_id, message_id,
                             disable_notification=None):
        """ See: https://core.telegram.org/bots/api#pinchatmessage """
        p = _strip(locals())
        return await self._api_request('pinChatMessage', _rectify(p))