Get the server's STATS information.
        Optional arguments:
        * query=None - STATS Query.
        * target=None - Target server.

def stats(self, query=None, target=None):
        """
        Get the server's STATS information.
        Optional arguments:
        * query=None - STATS Query.
        * target=None - Target server.
        """
        with self.lock:
            if not query:
                self.send('STATS')
            elif not target and query:
                self.send('STATS %s' % query)
            else:
                self.send('STATS %s %s' % (query, target))
            stat_lines = []
            while self.readable():
                msg = self._recv()
                if msg[1] == '219':
                    break
                else:
                    stat_lines.append(msg[3].replace(':', '', 1))
            return stat_lines