Add Ruby 3 to CI, make it pass #928
Description
- add Ruby 3 to https://github.com/github-changelog-generator/github-changelog-generator/blob/master/.circleci/config.yml
- perhaps remove the version specifier in the
gem install bundlersection, latest is fine - use newer ruby Orb
circleci/[email protected] - make it pass tests without warnings or failures
- or, if that's what you want, pick GitHub Actions instead?