CONTRIBUTING.rst: update link for dev readme

Author: Lorak-mmk

CONTRIBUTING.rst

@@ -18,7 +18,7 @@ good bug reports. They will not be repeated in detail here, but in general, the
 Pull Requests
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 If you're able to fix a bug yourself, you can `fork the repository <https://help.github.com/articles/fork-a-repo/>`_ and submit a `Pull Request <https://help.github.com/articles/using-pull-requests/>`_ with the fix.
-Please include tests demonstrating the issue and fix. For examples of how to run the tests, consult the `dev README <https://github.com/datastax/python-driver/blob/master/README-dev.rst#running-the-tests>`_.
+Please include tests demonstrating the issue and fix. For examples of how to run the tests, consult the `dev README <https://github.com/scylladb/python-driver/blob/master/README-dev.rst#running-the-tests>`_.
 
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