Reuse Contributing Message from keen-js

Use the same sentence for consistency.

Author: hydrosquall

README.rst

@@ -440,7 +440,9 @@ report them via Github Issues. We'd love to hear your feedback and ideas!
 Contributing
 ------------
 
-This is an open source project and we love involvement from the community! Hit us up with pull requests and issues. Here are our `guidelines <./CONTRIBUTING.md>`_ for how to contribute.
+This is an open source project and we love involvement from the community! Hit us up with pull requests and issues. 
+
+`Learn more about contributing to this project <./CONTRIBUTING.md>`_.
 
 .. |build-status| image:: https://secure.travis-ci.org/keenlabs/KeenClient-Python.png
     :target: http://travis-ci.org/keenlabs/KeenClient-Python