v0.19.0

What's Changed

Bug fixes

• Fix flatten for optional by @yukinarit in #542

Build

• Update coverage requirement from ==7.5.2 to ==7.5.3 by @dependabot in #534

Documentation

• Add monthly downloads badge to README by @Aman-Clement in #537
• Add mdbook project for Japanese translation by @yukinarit in #544

Performance improvements

• Cache typing functions to speed up @serde codegen by @yukinarit in #536
• Cache more code template to speed up @serde codegen by @yukinarit in #538

Other changes

• Update .github/release.yml by @yukinarit in #539

New Contributors

• @Aman-Clement made their first contribution in #537

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