Correct markdown link
-[binderhub][https://github.com/jupyterhub/binderhub]
-===============
+[binderhub][]
+=============
*This project is under active development and subject to change.*
@@ -30,3 +30,5 @@ License
-------
See `LICENSE` file in this repository.
+
+[binderhub]: https://github.com/jupyterhub/binderhub
