usql v0.19.0

What's Changed

• Fix Clickhouse Test by @murfffi in #455
• chore: fix function name in comment by @oftenoccur in #456
• Fixes in \copy implementation for Clickhouse by @murfffi in #457

New Contributors

• @murfffi made their first contribution in #455
• @oftenoccur made their first contribution in #456

Full Changelog: v0.18.1...v0.19.0