Fix double main call by updating es-module-shims to 1.5.6 (#279)

* Fix double main call by updating es-shims to 1.5.6

* Add changelog entry

Author: JordanMartinez

CHANGELOG.md

@@ -9,6 +9,7 @@ Breaking changes:
 New features:
 
 Bugfixes:
+- Stop double `main` invocation by updating `es-module-shims` to 1.5.6 (#279 by @JordanMartinez)
 
 Other improvements:
 

client/public/frame.html

@@ -41,7 +41,7 @@
   </script>
 
   <!-- ES Module Shims: Import maps polyfill for modules browsers without import maps support (all except Chrome 89+) -->
-  <script async src="https://ga.jspm.io/npm:es-module-shims@1.5.5/dist/es-module-shims.js" integrity="sha384-Zt+0efULC2q2dftjz0uNzXeTpPVuSLLekXQv9HoRuigkAyLPaUFvPVpYYhu2Xc/t" crossorigin="anonymous"></script>
+  <script async src="https://ga.jspm.io/npm:es-module-shims@1.5.6/dist/es-module-shims.js" integrity="sha384-Zi3OSEiS8YnN0yIdnkInyBlzXCGA18AMnQuPb+T1hXvE4DIDhGIp2QIBZcm4WNIU" crossorigin="anonymous"></script>
 
   <script src="js/frame.js"></script>
 </head>