Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,4 +1,4 @@
 Contributing
 ======
 
-Information on contributing to this repo is in the [Contributing Guide](https://github.com/aspnet/Home/blob/dev/CONTRIBUTING.md) in the Home repo.
+Information on contributing to this repo is in the [Contributing Guide](https://github.com/aspnet/Home/blob/master/CONTRIBUTING.md) in the Home repo.