Command-line dispatch.

def dispatch(self):
        """Command-line dispatch."""
        parser = argparse.ArgumentParser(description='Run an Inbox server.')

        parser.add_argument('addr', metavar='addr', type=str, help='addr to bind to')
        parser.add_argument('port', metavar='port', type=int, help='port to bind to')

        args = parser.parse_args()

        self.serve(port=args.port, address=args.addr)