message: Add crossorigin into scritp type=module tag inside  polymer-cli application templatepolymer-3.x to address issue with cli not working out of the box in Google Cloud Shell
diff: <script src="/node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
  - <script type="module" src="/src/<%= elementName %>/<%= elementName %>.js"></script>
  + <script type="module" src="/src/<%= elementName %>/<%= elementName %>.js" crossorigin></script>
  </head>
  <body>
  <<%= elementName %>></<%= elementName %>>
  