1.9.0

✨ New Features

• Add automatic support for yarn v2+ (#249) @mattbrictson

🏠 Housekeeping

• Upgrade CI to latest ruby, bundler patch versions (#250) @mattbrictson
• Bump mkdocs from 1.1.2 to 1.2.2 (#241, #246) @dependabot
• Update rubocop requirement from 1.14.0 to 1.18.4 (#240, #243, #247) @dependabot
• Update rubocop-performance requirement from 1.11.3 to 1.11.4 (#248) @dependabot
• Update rubocop-minitest requirement from 0.12.1 to 0.14.0 (#242, #245) @dependabot
• Update rubocop-rake requirement from 0.5.1 to 0.6.0 (#244) @dependabot