message: Add ViacomCBS to adopters list
diff: - [Materialize](http://materialize.com)
  - [Qualified](https://www.qualified.io)
  - [TrueLayer](https://truelayer.com)
  +- [ViacomCBS](https://viacomcbs.com)
  If you're using kube-rs and aren't on this list, please [submit a pull
  request](https://github.com/kube-rs/kube-rs/edit/master/ADOPTERS.md)!
  