Polyfill for Promise.allSettled

examples/templates/example.html

@@ -69,6 +69,7 @@
     <link rel="stylesheet" href="./resources/layout.css" type="text/css">
     <script src="https://unpkg.com/elm-pep"></script>
     <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder,Number.isInteger"></script>
+    <script src="./resources/Promise.allSettled.js"></script>
     {{{ extraHead.local }}}
     {{{ css.tag }}}
     <title>{{ title }}</title>