Fix the link to contributing instructions

Author: aniav

en/README.md

@@ -30,7 +30,7 @@ OK, [let's start at the beginning...](./how_the_internet_works/README.md)
 
 ## About and contributing
 
-This tutorial is maintained by [DjangoGirls](http://djangogirls.org/). If you find any mistakes or want to update the tutorial please [follow the contributing guidelines](https://github.com/DjangoGirls/tutorial/blob/master/CONTRIBUTING.md).
+This tutorial is maintained by [DjangoGirls](http://djangogirls.org/). If you find any mistakes or want to update the tutorial please [follow the contributing guidelines](https://github.com/DjangoGirls/tutorial/blob/master/README.md).
 
 ## Would you like to help us translate the tutorial to other languages?