Add ability to specify background color

[johanhaleby]

I'd like to change the background color of prompt so it would be nice if this would be available as a configuration option. Currently I do like this to get it to work the way I want:

PROMPT=%{$bg[white]%}'$(kube_ps1)'$PROMPT

[jonmosco]

Support added in 244ac9e for zsh (bash soon).

Please test and let me know if this works for you. You can set a background color with KUBE_PS1_BG_COLOR=<color>

[johanhaleby]

Works great in zsh! Thanks for adding support it.

[jonmosco]

This works now for bash. Closing this issue.