Update Google Analytics (Universal) async script example
Latest updated version:
<script>
ga=function(){ga.q.push(arguments)};ga.q=[];ga.l=+new Date;
ga('create','UA-XXXX-Y','auto');ga('send','pageview')
</script>
<script src="https://www.google-analytics.com/analytics.js" async defer></script>
Which was taken from the HTML5 Boilerplate repo commit by Mathias Bynens