extend the documentation of the command completion of zsh

[am3o]

Description

In the documentation is a little mistake about the zsh completion. The documentation of zsh recommends installing all completions to the $ZSH/cache/completions directory and reloading the completion plugin. The file .zprofile is executed in every new terminal session. So every time the completion is activated. It's more explicit.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Documentation

• fix the zsh completion inREADME.md

[tarys]

Nice, thanks a lot!
Looking forward for merge and new release :)

[am3o]

Its a pleasure and i really love the tool!

Sorry for the force pushes, I had to change my git identity

[am3o]

I thought a rebase is a good idea and than this happens... i will undo the rebase 😒

[d-rk]

@am3o don't worry about it. I will get it merged somehow :)
But first I need to find the time to take a closer look at the PR.

[am3o]

Now, it's cleaned up and we are back to the start point. Sorry for the confusing commits.

@d-rk Take your time to proof the PR.

[d-rk]

@am3o thank you for the PR.

I updated the PR according to the cobra docs: https://github.com/spf13/cobra/blob/master/shell_completions.md

I'm not an expert when it comes to zsh but:

• putting the autoload in ~/.zshrc instead of ~/.zprofile seems to be preferred (https://unix.stackexchange.com/a/71258/302068)
• on a new zsh installation $ZSH/cache/completions/_kafkactl evaluates to /cache/completions/_kafkactl which probably not the correct location. So I keep the location as documented in cobra docs