Merge pull request ddbourgin#13 from Tirzono/master

Fix link to CONTRIBUTING in README.md

Author: ddbourgin

README.md

@@ -140,4 +140,4 @@ library](https://docs.python.org/3/library/) and [numpy](https://www.numpy.org/)
 [SciPy library](https://scipy.github.io/devdocs/) is also permitted under special
 circumstances ;)
 
-See full contributing guidelines [here](./contributing.md). 
+See full contributing guidelines [here](./CONTRIBUTING.md).