Merge pull request #190 from martinRenou/binder_stable

Make binder point to stable branch

Author: martinRenou

README.md

@@ -4,7 +4,7 @@
 [![Latest PyPI version](https://img.shields.io/pypi/v/ipympl?logo=pypi)](https://pypi.python.org/pypi/ipympl)
 [![Latest conda-forge version](https://img.shields.io/conda/vn/conda-forge/ipympl?logo=conda-forge)](https://anaconda.org/conda-forge/ipympl)
 [![Latest npm version](https://img.shields.io/npm/v/jupyter-matplotlib?logo=npm)](https://www.npmjs.com/package/jupyter-matplotlib)
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/matplotlib/jupyter-matplotlib/master?urlpath=%2Flab%2Ftree%2Fexamples%2Fipympl.ipynb)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/matplotlib/jupyter-matplotlib/stable?urlpath=%2Flab%2Ftree%2Fexamples%2Fipympl.ipynb)
 [![Gitter](https://img.shields.io/badge/gitter-Join_chat-blue?logo=gitter)](https://gitter.im/jupyter-widgets/Lobby)
 
 Leveraging the Jupyter interactive widgets framework, jupyter-matplotlib