Breaks on macOS/BSD: non-portable split options

[ches]

Hi, thanks for this plugin.

Unfortunately as the title says, it breaks on macOS/BSD because of the usage of split:

https://github.com/alx741/vinfo/blob/3471cd547b591dcbcaf524a06c1f3423d8650b5d/autoload/vinfo/repo.vim#L35

The -d and --additional-suffix flags are GNU-specific, they're not POSIX and not in BSD split.

[alx741]

Hi, Because info is primarily a GNU/Linux thing I didn't bother to make it compatible with other systems, lately I've bee using FreeBSD and MacOS though so I will fix this. Thanks for letting me know