Add badges

Author: consideRatio

README.rst

@@ -2,6 +2,17 @@
 Jupyter Server Proxy
 ====================
 
+|Travis badge| |PyPI badge| |NPM badge|
+
+.. |Travis badge| image:: https://img.shields.io/travis/jupyterhub/jupyter-server-proxy/master.svg?logo=travis
+   :target: https://travis-ci.org/jupyterhub/jupyter-server-proxy
+
+.. |PyPI badge| image:: https://img.shields.io/pypi/v/jupyter-server-proxy.svg?logo=pypi
+   :target: https://pypi.python.org/pypi/jupyter-server-proxy
+
+.. |NPM badge| image:: https://img.shields.io/npm/v/jupyterlab-server-proxy.svg?logo=npm
+   :target: https://www.npmjs.com/package/jupyterlab-server-proxy
+
 Jupyter Server Proxy lets you run arbitrary external processes (such
 as RStudio, Shiny Server, syncthing, PostgreSQL, etc) alongside your
 notebook, and provide authenticated web access to them.