Update demo.html

Author: peachananr

demo.html

@@ -413,6 +413,15 @@ <h2>Add an ajax loading bar like on Youtube to all your ajax links.</h2>
       </div>
     </div>
     <a href="https://github.com/peachananr/loading-bar"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a>
-  </div>
+  </div><!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-11278966-3"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-11278966-3');
+</script>
+
 </body>
 </html>