fix blocked YT link

README.md

@@ -8,7 +8,7 @@ This is a live-coding tool, where you can write a 2D fragment/pixel shader while
 
 ![Screenshot](http://i.imgur.com/8K8IztLl.jpg)
 
-The tool was originally conceived and implemented after the Revision 2014 demoscene party's live coding competition where two contestants improv-code an effect in 25 minutes head-to-head: https://www.youtube.com/watch?v=-5P9rRUXaR0
+The tool was originally conceived and implemented after the Revision 2014 demoscene party's live coding competition where two contestants improv-code an effect in 25 minutes head-to-head. Wanna see how it looks in action? Check https://www.youtube.com/watch?v=KG_2q4OEhKc
 
 ## Keys
 - F2: toggle texture preview