Add karriere to prod users
Info provided by Marcel Juhnke at KubeCon
@@ -67,6 +67,7 @@ Its major features are:
- [Gini](https://gini.net)
- [Improwised Technologies](https://www.improwised.com/)
- [iQmetrix](https://www.iqmetrix.com)
+- [karriere tutor GmbH](https://www.karrieretutor.de)
- [Mettle](https://mettle.co.uk)
- [Payout](https://payout.one)
- [Qordoba](https://qordoba.com)
