reference the javascript using the unpkg CDN

Author: koddsson

examples/index.html

@@ -21,6 +21,7 @@
       </markdown-toolbar>
       <textarea class="mt-3 d-block width-full" id="textarea"></textarea>
     </div>
-    <script src="../dist/index.umd.js"></script>
+    <!-- script src="../dist/index.umd.js"></script -->
+    <script src="https://unpkg.com/@github/markdown-toolbar-element@latest/dist/index.umd.js"></script>
   </body>
 </html>