version 0.19.0

What's Changed

• Add a test test_duplicate_names by @basnijholt in #18
• Use ruff format instead of black by @basnijholt in #21
• Only resolve conda platforms when selector=="sel" by @basnijholt in #20
• Add optional platforms section to requirements.yaml by @basnijholt in #19

Full Changelog: v0.18.0...v0.19.0