19.2.0

What's Changed

• fix: make nested struct fields optional to match voluptuous defaults by @abhishekmadan30 in #909
• fix: restore payload_builder wrapping for dict schemas by @abhishekmadan30 in #910
• chore: bump version to 19.2.0 by @abhishekmadan30 in #912

Full Changelog: 19.1.0...19.2.0