update ga pixel

Author: svetly

_includes/analytics.html

@@ -3,8 +3,7 @@
   (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
   m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
   })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-
   ga('create', 'UA-47811332-1', 'gridstylesheets.org');
+  ga('require', 'displayfeatures');
   ga('send', 'pageview');
-
-</script>
+</script>