Update README.md

Author: mrholek

README.md

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 Please help us on [Product Hunt](https://www.producthunt.com/posts/coreui-open-source-bootstrap-4-admin-template-with-angular-2-react-js-vue-js-support). Thanks in advance!
 
-[![Bootstrap Admin Template](https://coreui.io/images/templates/coreui_3_free.jpg)](https://coreui.io/)
+[![Bootstrap Admin Template](https://coreui.io/images/github/vue-free-template-3.gif)](https://coreui.io/)
 
 Curious why I decided to create CoreUI? Please read this article: [Jack of all trades, master of none. Why Bootstrap Admin Templates suck.](https://medium.com/@lukaszholeczek/jack-of-all-trades-master-of-none-5ea53ef8a1f#.7eqx1bcd8)