Update example to use latest version

index.html

@@ -84,7 +84,7 @@
       <pre>
 &lt;script
   type="module"
-  src="https://unpkg.com/esp-web-tools@1.0.3/dist/web/install-button.js?module"
+  src="https://unpkg.com/esp-web-tools@2.0.1/dist/web/install-button.js?module"
 >&lt;/script>
 
 &lt;esp-web-install-button