Fixed
- Ignore blank lines and comments in `CODEOWNERS` file.
Fixed in [1](https://github.com/samueljsb/codeowners-diff/pull/1).
- Handle invalid paths in `CODEOWNERS` file.
Non-existent paths used to accidentally match *every* file in the repository.
Fixed in [3](https://github.com/samueljsb/codeowners-diff/pull/3).