Update codeclimate to 0.85.6

Update codeclimate from 0.85.2 (released on 2019-08-15) to 0.85.6 (released on 2019-11-19) mainly to support Rubocop 0.76 and ESLint 6:

This results in removal of the following deprecation warning:

Status: Downloaded newer image for codeclimate/codeclimate:0.85.5
WARNING: A new version (v0.85.6) is available. Upgrade instructions are available at: https://github.com/codeclimate/codeclimate#packages

Upstream changes

• 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.

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