Update CONTRIBUTING.markdown

Remove reddit link as it's not working anymore

Author: markvantilburg

CONTRIBUTING.markdown

@@ -17,7 +17,6 @@ You must provide a clear and simple way to reproduce the issue with the provided
 
 Although Slick is designed to be super easy to use, there's always things that can go wrong, especially when interacting with other plugins and complicated websites. If you are **having problems getting Slick to work**, or can't figure something out, **this repository**'s issues section **is not the place to ask about it**.  
 
-I have set up a subreddit for Slick discussion at [reddit.com/r/slickcarousel](http://www.reddit.com/r/slickcarousel/).  
 And a gitter chatroom here: [gitter.im/kenwheeler/slick](https://gitter.im/kenwheeler/slick).  
 And finally you can ask the world for help, and find out if anyone else has your problem at [stackoverflow](http://stackoverflow.com/search?q=slick+carousel).