feat(lib): show upstream branch in `git_prompt_info` (#9188)
feat(lib): show upstream branch in `git_prompt_info` (#9188)

Show the remote branch the local branch is tracking if `ZSH_THEME_GIT_SHOW_UPSTREAM`
is set, like so: `ZSH_THEME_GIT_SHOW_UPSTREAM=1`.

Co-authored-by: Marc Cornellà <59979d0011543a9dd9557aea70a057e57c9d0d9e@live.com>
erwinvaneijk/oh-my-zsh,erwinvaneijk/oh-my-zsh