docs: Update fair-software.eu badge

By adding most stuff to our "master" branch, we acquired
two more points.

(cherry picked from commit db98bfd)

README.md

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 # FairRoot
 
-[![license](https://alfa-ci.gsi.de/shields/badge/license-LGPL--3.0-orange.svg)](COPYRIGHT) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3896282.svg)](https://doi.org/10.5281/zenodo.3896282) [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7131/badge)](https://bestpractices.coreinfrastructure.org/projects/7131) [![fair-software.eu](https://img.shields.io/badge/fair--software.eu-%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8B%20%20%E2%97%8B%20%20%E2%97%8B-orange)](https://fair-software.eu)
+[![license](https://alfa-ci.gsi.de/shields/badge/license-LGPL--3.0-orange.svg)](COPYRIGHT) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3896282.svg)](https://doi.org/10.5281/zenodo.3896282) [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7131/badge)](https://bestpractices.coreinfrastructure.org/projects/7131) [![fair-software.eu](https://img.shields.io/badge/fair--software.eu-%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8B%20%20%E2%97%8F%20%20%E2%97%8F-yellow)](https://fair-software.eu)
 
 ## The FairRoot framework
 A simulation, reconstruction and analysis framework that is based on the ROOT system.