upgrade GA

Author: geekplux

Diff for: docs/index.html

@@ -22,4 +22,13 @@
 <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
 <script src="//unpkg.com/docsify/lib/plugins/zoom-image.js"></script>
 <script src="//unpkg.com/docsify/lib/plugins/ga.js"></script>
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-TD85LK5TX0"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'G-TD85LK5TX0');
+</script>
 </html>