Update codeclimate to 0.85.4

Update codeclimate from 0.85.2 (released on 2019-04-15) to 0.85.4 (released on 2019-06-07).

To support Rubocop 0.71

• Diff: https://github.com/codeclimate/codeclimate/compare/v0.85.2...v0.85.4
• Changelogs:
  • https://github.com/codeclimate/codeclimate/releases/tag/v0.85.4

cf.

• #17 (closed) (!27 (merged))
• #15 (closed) (!25 (merged))