Merge branch 'doc/readme-update-buildbadges' into 'master'

[readme] Update build badges

See merge request !2075

README.md

@@ -82,8 +82,8 @@ You can also cite specific releases published on Zenodo:
 Automated Testing
 ==================
 
-* Dumux 3.2 / Dune 2.7: [![buildbot badge](https://git.iws.uni-stuttgart.de/buildbot/badges/dumux-releases-3.2-dune-releases-2.7-clang-full.svg)](https://git.iws.uni-stuttgart.de/buildbot/#/builders)
-* Dumux master / Dune 2.7: [![buildbot badge](https://git.iws.uni-stuttgart.de/buildbot/badges/dumux-master-dune-releases-2.7-clang-full.svg)](https://git.iws.uni-stuttgart.de/buildbot/#/builders)
+* Dumux 3.2 / Dune 2.7: [![buildbot badge](https://git.iws.uni-stuttgart.de/buildbot/badges/dumux-releases-3.2-dune-rel-2-7-clang-full.svg)](https://git.iws.uni-stuttgart.de/buildbot/#/builders)
+* Dumux master / Dune 2.7: [![buildbot badge](https://git.iws.uni-stuttgart.de/buildbot/badges/dumux-master-dune-rel-2-7-clang-full.svg)](https://git.iws.uni-stuttgart.de/buildbot/#/builders)
 * Dumux master / Dune master: [![buildbot badge](https://git.iws.uni-stuttgart.de/buildbot/badges/dumux-master-dune-master-clang-full.svg)](https://git.iws.uni-stuttgart.de/buildbot/#/builders)
 
 DuMu<sup>x</sup> features many tests (some unit tests and test problems) that can