Polyfill fetch

main.py

@@ -100,6 +100,7 @@ html = """<!DOCTYPE html>
         <small><a href="https://git.wut.ee/arti/peltier_jacket" style="color:black;">Source code</a></small>,  <small>Good luck!</small>
 
         <script type="text/javascript" src="/smoothie.js"></script>
+        <script type="text/javascript" src="/fetch.js"></script>
         <script type="text/javascript" src="/gauge.min.js"></script>
         <script type="text/javascript" src="/main.js"></script>
     </body>