2.0.0rc3 Release

Features:

• Allow passing schema and spec keyword args to setup_openapi (#86)

Fixes:

• Handle all errors on creating OpenAPI spec from schema (#74)
• Allow nullable arrays & objects in request/response data (#85)

Other:

• Cast return values instead of type ignore comments
• Do not include changelog into dist (#72)
• Update docs with new rororo slogan (#76)
• Create GitHub release at pushing git tag (#78)
• Bump pre-commit hooks
• Preserve multiline strings in release body (#78)