Update codeclimate to 0.85.6

Update codeclimate from 0.85.5 (released on 2019-08-15) to 0.85.6 (released on 2019-11-19).

To support Rubocop 0.75/0.76 and eslint 6:

• Diff: https://github.com/codeclimate/codeclimate/compare/v0.85.5...v0.85.6
• Changelogs:
  • https://github.com/codeclimate/codeclimate/releases/tag/v0.85.6

cf.

• (!34 (merged))
• #19 (closed) (!28 (merged))
• #17 (closed) (!27 (merged))
• #15 (closed) (!25 (merged))