New copy-pasteable example

[netmilk]

No description provided.

[coveralls]

Coverage decreased (-0.09%) when pulling 86b054f on netmilk/readme-update into 9dec2cc on master.

[abtris]

Try add semicolon as

var express = require('express');
var app = express();

app.get('/', function (req, res) {
  res.json({message: 'Hello World!'});
});

var server = app.listen(3000);

[coveralls]

Coverage decreased (-0.09%) when pulling 56550cd on netmilk/readme-update into 9dec2cc on master.