move from ga to gtag

publishconf.py

@@ -22,4 +22,4 @@
 # Following items are often useful when publishing
 GITHUB_URL='https://github.com/data-show/notebooks'
 TWITTER_USERNAME='DataShow_'
-GOOGLE_ANALYTICS = 'UA-162035849-2'
+GOOGLE_ANALYTICS = 'G-VDKS9XPQW0'

templates/partial/ga.html

@@ -1,13 +1,9 @@
-<!-- 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');
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id={{ GOOGLE_ANALYTICS }}"></script>
+<script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag() { dataLayer.push(arguments); }
+    gtag('js', new Date());
 
-    ga('create', '{{ GOOGLE_ANALYTICS }}', 'auto');
-    ga('send', 'pageview');
-</script>
-<!-- End Google Analytics -->
+    gtag('config', '{{ GOOGLE_ANALYTICS }}');
+</script>