message: exclude localhost
diff: <!-- Global site tag (gtag.js) - Google Analytics -->
  <script async src="https://www.googletagmanager.com/gtag/js?id=UA-139961497-1"></script>
  <script>
  + if (window.location.hostname !== 'localhost') {
  window.dataLayer = window.dataLayer || [];
  +
  function gtag() {
  dataLayer.push(arguments);
  }
  +
  gtag('js', new Date());
  gtag('config', 'UA-139961497-1');
  + }
  </script>
  </body>
  </html>
  