* Update rubocop requirement from ~> 0.46.0 to ~> 0.67.2

Updates the requirements on [rubocop](https://github.com/rubocop-hq/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.46.0...v0.67.2)
Signed-off-by: dependabot[bot] <support@dependabot.com>

* Make changes to let Rubocop pass in CI

* Fixed some offenses
* Added test.

Fixed some offenses

Reduced the Cyclomatic complexity.
#330 By default didn't annotate activeadmin models.
This close #330

This conversion is done by Transpec 2.2.5 with the following command:
    transpec

* 34 conversions
    from: obj.should
      to: expect(obj).to

* 27 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 18 conversions
    from: == expected
      to: eq(expected)

* 4 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 4 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

For more details: https://github.com/yujinakayama/transpec#supported-conversions