Make badge links https per minrk review
`BinderHub`_
============
-.. image:: http://readthedocs.org/projects/binderhub/badge/?version=latest
- :target: http://binderhub.readthedocs.io/en/latest/?badge=latest
+.. image:: https://readthedocs.org/projects/binderhub/badge/?version=latest
+ :target: https://binderhub.readthedocs.io/en/latest/?badge=latest
:alt: Documentation Status
What is BinderHub?
