Fix path issue for Windows (#313)

* Run tests for Windows

* Add test to reproduce error

* Canonicalize paths in test

* Revert me: Run only necessary tests

* Join `Path`'s to avoid OS-specific separators

* Revert me: Debug output

* Fix workflow

* Revert me: Debugging

* Windows debugging

* More debugging

* Debugging

* Debugging

* Add nightly

* Debugging

* Debugging

* Debugging

* Debugging

* Debugging

* Fix commands

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Debug path

* Remove eprintln's

* Test should fail

* Test should run

* Test should run

* Restore Windows testing

* Apply `cargo fmt`

* Fix default

* Remove debug stuff

* Run tests only `master`

* Update changelog