Fix link in README file

Author: dhendriks

README.md

@@ -30,7 +30,7 @@ It is based on trunk revision r483 from 2011-11-24.
 
 See [CHANGES.md](CHANGES.md) for all changes that have been made in this fork.
 
-See [CONTRIBUTORS.md][CONTRIBUTORS.md] for all contributors.
+See [CONTRIBUTORS.md](CONTRIBUTORS.md) for all contributors.
 
 ## License