Send message to peer.
        :param peer: Peer to send message to.
        :param text: Text to send.
        :param reply: Message object or message_id to reply to.
        :param link_preview: Whether or not to show the link preview for this message
        :param on_success: Callback to call when call is complete.

def send_message(self, peer: Peer, text: str, reply: int=None, link_preview: bool=None, on_success: callable=None):
        """
        Send message to peer.
        :param peer: Peer to send message to.
        :param text: Text to send.
        :param reply: Message object or message_id to reply to.
        :param link_preview: Whether or not to show the link preview for this message
        :param on_success: Callback to call when call is complete.
        """
        pass