GitLab

* update cobra to get new zsh completion https://github.com/spf13/cobra/commit/2c5a0d300f8ba1cd142776508519aba999b5e77f and to fix this https://github.com/spf13/cobra/commit/675ae5f5a98cc705a6d54f4c487ab81230604137

* add --no-descriptions also for zsh

* update docs

* update tests

* removed hack https://github.com/spf13/cobra/issues/1121