Set module option for transition before we cut a new release

Author: muan

examples/index.html

@@ -15,7 +15,7 @@
   </div>
   <script type="module">
     // import checkAll from '../dist/index.js'
-    import checkAll from 'https://unpkg.com/@github/check-all@latest/dist/index.js'
+    import checkAll from 'https://unpkg.com/@github/check-all@latest?module'
     checkAll(document.querySelector('[data-check-all-container]'))
   </script>
 </body>