update active maintainers of crate

library/crate

@@ -1,11 +1,7 @@
-Maintainers: Bernd Dorn <[email protected]> (@dobe),
-             Mathias Fußenegger <[email protected]> (@mfussenegger),
-             Matthias Wahl <[email protected]> (@mfelsche),
+Maintainers: Christian Bader <[email protected]> (@christianbader),
              Michael Beer <[email protected]> (@mikethebeer),
+             Mathias Fußenegger <[email protected]> (@mfussenegger),
              Christian Haudum <[email protected]> (@chaudum),
-             Ruslan Kovalov <[email protected]> (@kovrus),
-             Claus Matzinger <[email protected]> (@celaus),
-             Christian Bader <[email protected]> (@christianbader),
              Mika Naylor <[email protected]> (@autophagy)
 GitRepo: https://github.com/crate/docker-crate.git