v2.1.2 - Fix comma-separated options

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #72
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #82
• chore(ci): add LanguageTool 6.1 explicitly by @jeertmans in #83
• fix(cli/lib): properly serialize comma separated values by @jeertmans in #86

Full Changelog: v2.1.1...v2.1.2