Bump shoulda-matchers from 4.5.1 to 5.0.0

Bumps [shoulda-matchers](https://github.com/thoughtbot/shoulda-matchers) from 4.5.1 to 5.0.0.
- [Release notes](https://github.com/thoughtbot/shoulda-matchers/releases)
- [Changelog](https://github.com/thoughtbot/shoulda-matchers/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thoughtbot/shoulda-matchers/compare/v4.5.1...v5.0.0)

---
updated-dependencies:
- dependency-name: shoulda-matchers
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -457,8 +457,8 @@ GEM
       concurrent-ruby
       faraday
     set (1.0.1)
-    shoulda-matchers (4.5.1)
-      activesupport (>= 4.2.0)
+    shoulda-matchers (5.0.0)
+      activesupport (>= 5.2.0)
     simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)