Support to Google Analytics 4 gtag.js

[ricardofrantz]

Hi, I want to link my page to Google Analytics, but their latest updates do not seem to be compatible with the current options.

<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-XXXXXXXXXXXC"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'G-XXXXXXXXXXC');
</script>

[rjzupkoii]

This has been addressed with pull request #1183