Temporarily switch image path
-# <a href="https://github.com/jupyter/repo2docker"><img src="https://media.githubusercontent.com/media/jupyter/repo2docker/master/docs/source/_static/images/repo2docker.png" height="48px" /> repo2docker</a>
+# <a href="https://github.com/jupyter/repo2docker"><img src="https://raw.githubusercontent.com/jupyter/repo2docker/3fa7444fca6ae2b51e590cbc9d83baf92738ca2a/docs/source/_static/images/repo2docker.png" height="48px" />repo2docker</a>
[![Build Status](https://travis-ci.org/jupyter/repo2docker.svg?branch=master)](https://travis-ci.org/jupyter/repo2docker)
[![Documentation Status](https://readthedocs.org/projects/repo2docker/badge/?version=latest)](http://repo2docker.readthedocs.io/en/latest/?badge=latest)
