Fix HiRSE Code Promo Badge formatting in README

Author: pancetta

README.md

@@ -5,7 +5,8 @@
 [![fair-software.eu](https://img.shields.io/badge/fair--software.eu-%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F-green)](https://fair-software.eu)
 [![SQAaaS badge shields.io](https://img.shields.io/badge/sqaaas%20software-silver-lightgrey)](https://api.eu.badgr.io/public/assertions/aS8J0NDTTjCyYP6iVufviQ "SQAaaS silver badge achieved")
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/pySDC?logo=pypi)](https://pypistats.org/packages/pysdc)
-![HiRSE Code Promo Badge](https://img.shields.io/badge/Promo-8db427?label=HiRSE&labelColor=005aa0&link=https%3A%2F%2Fgo.fzj.de%2FCodePromo) 
+[![HiRSE Code Promo Badge](https://img.shields.io/badge/Promo-8db427?label=HiRSE&labelColor=005aa0&link=https%3A%2F%2Fgo.fzj.de%2FCodePromo)](https://go.fzj.de/CodePromo)
+
 # Welcome to pySDC!
 
 The `pySDC` project is a Python implementation of the