Fix link to contributing guide

Author: AlexVanderbist

README.md

@@ -125,7 +125,7 @@ Please see [CHANGELOG](CHANGELOG.md) for more information what has changed recen
 
 ## Contributing
 
-Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
+Please see [CONTRIBUTING](.github/CONTRIBUTING.md) for details.
 
 ### Security