Bump rubocop from 1.30.1 to 1.31.0
Bump rubocop from 1.30.1 to 1.31.0

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.30.1 to 1.31.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.30.1...v1.31.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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