Arch Linux - git-auto-sync check causes panic: runtime error: slice bounds out of range

I managed to get it running on Arch Linux (CachyOS).

The sync command actually worked out-of-the-box, but I wasted quite some time first because the "check" command caused a panic:

```
panic: runtime error: slice bounds out of range [18:17]

goroutine 1 [running]:
github.com/GitJournal/git-auto-sync/common.ShouldIgnoreFile({0xc0000241e4, 0x11}, {0xc0000249f0?, 0xc00007fac0?})
/home/narve/misc-packages/git-auto-sync/common/ignore.go:30 +0x35b
main.main.func3(0xc00007fac0)
/home/narve/misc-packages/git-auto-sync/main.go:105 +0xda
github.com/urfave/cli/v2.(*Command).Run(0xc0000ead80, 0xc00007f9c0)
/home/narve/go/pkg/mod/github.com/urfave/cli/v2@v2.5.1/command.go:163 +0x565
github.com/urfave/cli/v2.(*App).RunContext(0xc0000af1e0, {0xac2208, 0xebdca0}, {0xc000020080, 0x2, 0x2})
/home/narve/go/pkg/mod/github.com/urfave/cli/v2@v2.5.1/app.go:313 +0xabb
github.com/urfave/cli/v2.(*App).Run(...)
/home/narve/go/pkg/mod/github.com/urfave/cli/v2@v2.5.1/app.go:224
main.main()
/home/narve/misc-packages/git-auto-sync/main.go:159 +0x876

```

I didn't understand why there was a +1, (and I've never programmed in Go...), so I removed +1 and then it doesn't panic anymore.
The sync command itself seems to work.