docs: update screenshot url

Author: icebob

README.md

@@ -15,7 +15,7 @@ Virtual keyboard component for Vue.js v1.x.x. Designed to Raspberry Pi Touch Dis
 ## Demo
 [JSFiddle demo](https://jsfiddle.net/icebob/88n7c1L8/)
 
-[![Screenshot](http://ultraimg.com/images/2016/10/25/xn5P.png)](https://jsfiddle.net/icebob/88n7c1L8/)
+[![Screenshot](https://cloud.githubusercontent.com/assets/306521/19687992/001c995e-9ac8-11e6-9695-994579beb701.png)](https://jsfiddle.net/icebob/88n7c1L8/)
 
 ## Features
 - multiple layout