Load google fonts async to improve site performance

google-fonts-async.html

<script src="//ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js"></script>
<script>
 WebFont.load({
    google: {
      families: [
        'Montserrat:400,700',
        'Raleway:100,200,300,400,500,600',
        'Lato:400,100,100italic,300,300italic,400italic,700,700italic,900,900italic'
      ]
    }
  });
</script>