Bump shoulda from 3.6.0 to 4.0.0 (#169)
Bump shoulda from 3.6.0 to 4.0.0 (#169)

Bumps [shoulda](https://github.com/thoughtbot/shoulda) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/thoughtbot/shoulda/releases)
- [Changelog](https://github.com/thoughtbot/shoulda/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thoughtbot/shoulda/compare/v3.6.0...v4.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Co-authored-by: Philip Hallstrom <3ba3974e96044dcde818e6310ed799abe10671d4@pjkh.com>
railslink/railslink,railslink/railslink,railslink/railslink,railslink/railslink