Update README.md

Author: mariobehling

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)
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+[![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.