docs: update GA

Author: streamtw

docs/_config.yml

@@ -3,7 +3,7 @@ theme: jekyll-theme-cayman
 # Setup
 title: Laravel File Manager
 description: It's like Dropbox for your Laravel app.
-google_analytics: UA-92410814-4
+google_analytics: G-X9XY279785
 
 # About/contact
 author:

docs/_layouts/default.html

@@ -127,14 +127,13 @@ <h2 class="project-tagline">{{ site.description | default: site.github.project_t
     </section>
 
     {% if site.google_analytics %}
-      <script type="text/javascript">
-        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-        (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');
+      <script async src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics }}"></script>
+      <script>
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+        gtag('js', new Date());
 
-        ga('create', '{{ site.google_analytics }}', 'auto');
-        ga('send', 'pageview');
+        gtag('config', '{{ site.google_analytics }}');
       </script>
     {% endif %}
   </body>