Bump rubocop from 1.3.1 to 1.7.0 (#15447)

Bump rubocop from 1.3.1 to 1.7.0 (#15447)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 1.3.1 to 1.7.0.
- [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/v1.3.1...v1.7.0)

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