Improve the base64 decoding command in the documentation

[kfox1111]

Very minor tweak. in the docs, rather then this:
-o jsonpath='{.data.token}' | base64 --decode

you can do:
-o go-template='{{.data.token | base64decode}}'

It should work on all platforms as its built into kubectl now.

[prydonius]

thanks for the tip, do you know what version of kubectl added this? I think we didn't document kubectl port-forward svc/kubeapps because it required kubectl 1.9+

[kfox1111]

I don't remember. I think is was 1.11, but don't quote me. :)

If your worried about 1.9+, then its a no go.

[prydonius]

I think at that point we cared about 1.8 support because the supported versions were 1.8-1.10. With 1.13, it wouldn't necessarily be bad to require 1.11+, especially since kubectl is pretty good with backwards/forwards compatibility.

[kfox1111]

+1

I can confirm it is 1.11+. I found a 1.10 laying around and it doesnt work, but does in 1.11.

[prydonius]

Thanks for confirming! cc @kubeapps/maintainers, what do you think?

[migmartri]

This is great, thanks @kfox1111 for reporting it!

@prydonius. The issue to me is not requiring 1.11+ is explaining the fact that we do.

Is this the only platform specific command in our docs? If it is, I agree with going forward now by adding the new syntax, we might want to keep both for some time though.

[andresmgot]

We can fix this now. Kubernetes 1.11 has been out for a while.