message: Remove outdated Flow suppression
diff: @@ -35,7 +35,6 @@ const createServer = async (args /* : CreateServerArgs */) => {
  const port = normalizePort(process.env.PORT || '3000');
  const server = http.createServer(createApp(args));
  - // $FlowFixMe https://github.com/facebook/flow/pull/4176
  const listen = util.promisify(server.listen).bind(server);
  await listen(port);
  