message: Update README.md
  Define app port in example.
diff: @@ -168,7 +168,8 @@ app.service('users').hooks({
  }
  });
  -let server = app.listen(3030);
  +const port = 3030;
  +let server = app.listen(port);
  server.on('listening', function() {
  console.log(`Feathers application started on localhost:${port}`);
  });
  