Bump shoulda from 3.1.1 to 4.0.0

[dependabot-preview[bot]]

Bumps shoulda from 3.1.1 to 4.0.0.

Changelog

Sourced from shoulda's changelog.

4.0.0 (2020-06-13)

• shoulda now brings in shoulda-context 2.0.0, which adds compatibility for Ruby 2.7, Rails 6.0, and shoulda-matchers 4.0! Note that there are some backward incompatible changes, so please see the changelog entry for this release to learn more.

Commits

• 8fdc50f Bump version to 4.0.0 🎉
• 24c718d Bump version to 4.0.0.rc2
• 50a1b85 Add gemspec to Gemfile
• 3f092d7 Update default dev version of Ruby to 2.7.1
• e254bb5 Upgrade shoulda-context to 2.0.0.rc4
• b92362f Update dependencies
• 3ba74dd Bump version to 4.0.0.rc1
• 5a96c13 Fix Rubocop config so rubocop can run
• cf45347 Update README, fix thoughtbot logo
• 3132c10 Revamp this gem
• Additional commits viewable in compare view

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