Update README.md (#709)

Author: mariobehling

README.md

@@ -5,7 +5,6 @@ Desktop application for the [Pocket Science Lab (PSlab)](https://pslab.io) open
 Development [![Build Status](
 https://github.com/fossasia/pslab-desktop/workflows/Build/release/badge.svg)](
 https://github.com/fossasia/pslab-desktop/actions)
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/8259e5c2220f484e95a88cf4aaed1a96)](https://www.codacy.com/app/mb/pslab-desktop?utm_source=github.com&utm_medium=referral&utm_content=fossasia/pslab-desktop&utm_campaign=Badge_Grade)
 [![Mailing List](https://img.shields.io/badge/Mailing%20List-FOSSASIA-blue.svg)](https://groups.google.com/forum/#!forum/pslab-fossasia)
 [![Gitter](https://badges.gitter.im/fossasia/pslab.svg)](https://gitter.im/fossasia/pslab?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Twitter Follow](https://img.shields.io/twitter/follow/pslabio.svg?style=social&label=Follow&maxAge=2592000?style=flat-square)](https://twitter.com/pslabio)