git aliases depend on gstat, but do not mention it

[samoylovfp]

Steps to reproduce:

• install nushell on a fresh Ubuntu
• download git-aliases to nushell config dir and add use git-ailases.nu * to the config file
• run exec nu to reload the configuration
• run git_current_branch

What happens

Error: nu::shell::external_command

  × External command failed
   ╭─[/home/fil/.config/nushell/git-aliases.nu:2:6]
 1 │ export def git_current_branch [] {
 2 │     (gstat).branch
   ·      ──┬──
   ·        ╰── Command `gstat` not found
 3 │ }
   ╰────
  help: Did you mean `gst`?

What I expected to happen

The script to have mentioned that gstat is a dependency and where to get it.

--

Thank you for this amazing shell!

[fdncred]

Good catch. Didn't know of this dependency. I commented on your PR.