Can't include tracker via Google Tag Manager

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Including userTrack through Google Tag Manager is not recommended. 
Google Tag Manager is blocked by ad-blockers, which means that userTrack will fail to load too.
Problem:
Including the userTrack tracking script via Google Tag Manager doesn't work.
Uncaught TypeError: Cannot read property 's' of undefined at ust.min.js?v=3.4.2:2
Cause:
The issue occurs because when you include multiple scripts via GTM, the include order is not guaranteed.
The default way to include userTrack
<script>UST_CT = [];UST = { s: Date.now(), addTag: function(tag) { UST_CT.push(tag) } };UST.addEvent = UST.addTag;</script>
<script src="https://your.usertrack.com/server/ust.min.js?v=x.x.x" async></script>
With Google Tag Manager, the second <script> tag might be loaded before the first one.
Solution:
A quick solution is to use a single script tag and load ust.min.js dynamically like this:
Single-script way to include userTrack
<script>UST_CT = [];UST = { s: Date.now(), addTag: function(tag) { UST_CT.push(tag) } };UST.addEvent = UST.addTag;
var ust_min_js = document.createElement("script");
ust_min_js.src = 'https://your.usertrack.com/server/ust.min.js?v=x.x.x';
document.head.appendChild(ust_min_js);
</script>
Make sure to replace https://your.usertrack.com/server/ust.min.js?v=x.x.x with the actual URL to your tracking file.
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