old_contents: 'use strict';
  
  var Yeelight = require('../lib/yeelight').Yeelight;
  const yeelight = new Yeelight({verbose: true, discoveryTimeout: 100});
  
  yeelight
    .discover(2000)
    .then((devices) => console.log(devices.length));
  
new_contents: 'use strict';
  
  const Yeelight = require('../lib/yeelight').Yeelight;
  const yeelight = new Yeelight({verbose: true});
  
  yeelight
    .discover(2000)
    .then((devices) => console.log(devices.length));
  
subject: Update discover.js