Add Kubernetes Version into yaml output

[guettli]

Is your feature request related to a problem? Please describe.

I would like to see the Kubernetes Version in the yaml output.

And the output of k config current-context

Would you accept a PR?

Do you want to do that, or should I create a PR?

Describe the solution you'd like

I would like to get an answer to above questions.

Describe alternatives you've considered

Forking Popeye, but a PR would be better.

Additional context

I have a filter which parses the yaml format. I would like to ignore some things depending on Kubernetes Cluster and