Update README.md

mariobehling · web-flow · commit 9f1fea66c9e0 · 2019-05-13T15:52:48.000+02:00
diff --git a/README.md b/README.md
@@ -5,6 +5,7 @@ The Pocket Science Lab from FOSSASIA <https://pslab.io>
 [![Build Status](https://travis-ci.org/fossasia/pslab-python.svg?branch=development)](https://travis-ci.org/fossasia/pslab-python)
 [![Gitter](https://badges.gitter.im/fossasia/pslab.svg)](https://gitter.im/fossasia/pslab?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/ce4af216571846308f66da4b7f26efc7)](https://www.codacy.com/app/mb/pslab-python?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=fossasia/pslab&amp;utm_campaign=Badge_Grade)
+[![Mailing List](https://img.shields.io/badge/Mailing%20List-FOSSASIA-blue.svg)](https://groups.google.com/forum/#!forum/pslab-fossasia)
 [![Twitter Follow](https://img.shields.io/twitter/follow/pslabio.svg?style=social&label=Follow&maxAge=2592000?style=flat-square)](https://twitter.com/pslabio)
 
 This repository hosts the python library for communicating with PSLab. This can be installed on a linux pc/raspberry pi. With this, one can communicate with the hardware using simple python code. 
