Implement root command for gibo.bat

[kai2nenobu]

Before

> .\gibo.bat version
gibo 2.1.2 by Simon Whitaker <sw@netcetera.org>
https://github.com/simonwhitaker/gitignore-boilerplates

After

> .\gibo.bat version
gibo 2.2.2 by Simon Whitaker <sw@netcetera.org>
https://github.com/simonwhitaker/gibo

[simonwhitaker]

There are some differences between gibo and gibo.bat, so I decided not to keep the versions in sync.

v2.2 of gibo added the gibo root command, which is a pretty easy one to implement. Would you like to implement that in gibo.bat and then bump the version in gibo.bat to 2.2?

[kai2nenobu]

@simonwhitaker OK, I'll try it.

[kai2nenobu]

(EDIT: Squash and modify version 2.2)

I've implemented root command for gibo.bat. Please review😄

> .\gibo.bat help
gibo 2.2 by Simon Whitaker <sw@netcetera.org>
https://github.com/simonwhitaker/gibo

Fetches gitignore boilerplates from github.com/github/gitignore

Usage:
    gibo [command]

Example:
    gibo dump Python NotepadPP >> .gitignore

Options:
    dump expr...  Dump boilerplate(s) to stdout
    help          Display this help text
    list          List available boilerplates
    root          Show the directory where gibo stores its boilerplates
    search expr   Search inside boilerplates for expr
    update        Update list of available boilerplates
    version       Display current script version
> .\gibo.bat root
C:\Users\kai2nenobu\AppData\Roaming\.gitignore-boilerplates
> set GIBO_BOILERPLATES=%USERPROFILE%\.gibo
> .\gibo.bat root
C:\Users\kai2nenobu\.gibo

[simonwhitaker]

Looks good! Thanks @kai2nenobu