docs: fix contributing link

Author: Alan Shaw

README.md

@@ -402,7 +402,7 @@ The js-ipfs-http-client is a work in progress. As such, there's a few things you
 
 **Want to hack on IPFS?**
 
-[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/contributing.md)
+[![](https://cdn.rawgit.com/jbenet/contribute-ipfs-gif/master/img/contribute.gif)](https://github.com/ipfs/community/blob/master/CONTRIBUTING.md)
 
 ## Historical context