Update README.md

Author: cristijora

README.md

@@ -28,7 +28,7 @@ Other demos:
 * [Customized buttons with slots](https://jsfiddle.net/bt5dhqtf/103/) Replace stuff you don't like
 * [Call a function before tab switch](https://jsfiddle.net/bt5dhqtf/105/)
 * [Complete form example](https://jsfiddle.net/CristiJ/bt5dhqtf/286/) integrated with [vue-form-generator](https://github.com/icebob/vue-form-generator)
-* [Element UI form integration](https://jsfiddle.net/bt5dhqtf/1544/)
+* [Element UI form integration](https://codesandbox.io/s/l9mz5zn7yz)
 * [Vuelidate integration](https://jsfiddle.net/CristiJ/bt5dhqtf/1119/)
 * [Dynamic components for tabs](https://jsfiddle.net/bt5dhqtf/973/)
 * [Vue router integration](https://jsfiddle.net/bt5dhqtf/267/) You can place a `router-view` inside the wizard and have a separate page per tab. A `route` prop must be passed to the tabs you want to handle certain tabs