Bump valid-directory from 2.7.0 to 3.0.0 (#68)

Bumps [valid-directory](https://github.com/bevry/valid-directory) from 2.7.0 to 3.0.0.
- [Release notes](https://github.com/bevry/valid-directory/releases)
- [Changelog](https://github.com/bevry/valid-directory/blob/master/HISTORY.md)
- [Commits](bevry/valid-directory@v2.7.0...v3.0.0)

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