Add type='module' to script tag

Author: Muhnad

examples/index.html

@@ -23,7 +23,7 @@
     </div>
   </tab-container>
 
-  <!-- <script src="../dist/index.umd.js"></script> -->
-  <script src="https://unpkg.com/@github/tab-container-element@latest/dist/index.umd.js"></script>
+  <!-- <script src="../dist/index.js" type="module"></script> -->
+  <script src="https://unpkg.com/@github/tab-container-element@latest/dist/index.js" type="module"></script>
 </body>
 </html>