Send audio clip to peer.
        :param peer: Peer to send message to.
        :param audio: File path to audio to send.
        :param reply: Message object or message_id to reply to.
        :param on_success: Callback to call when call is complete.

        :type reply: int or Message

def send_audio(self, peer: Peer, audio: str, reply: int=None, on_success: callable=None,
                   reply_markup: botapi.ReplyMarkup=None):
        """
        Send audio clip to peer.
        :param peer: Peer to send message to.
        :param audio: File path to audio to send.
        :param reply: Message object or message_id to reply to.
        :param on_success: Callback to call when call is complete.

        :type reply: int or Message
        """
        if isinstance(reply, Message):
            reply = reply.id

        audio = botapi.InputFile('audio', botapi.InputFileInfo(audio, open(audio, 'rb'), get_mimetype(audio)))

        botapi.send_audio(chat_id=peer.id, audio=audio, reply_to_message_id=reply, on_success=on_success,
                          reply_markup=reply_markup, **self.request_args).run()