`unwrap` is not that safe ...

Hello,

it seems that an `unwrap` considered safe, is panicking.

https://github.com/Gilnaa/globwalk/blob/8973fa2bc560be54c91448131238fa50d56ee121/src/lib.rs#L381

```sh
thread '<unnamed>' panicked at /home/..../index.crates.io-6f17d22bba15001f/globwalk-0.9.1/src/lib.rs:381:78:
called `Result::unwrap()` on an `Err` value: StripPrefixError(())
```