docs: update CHANGELOG.md

CHANGELOG.md

@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [0.9.0] - 2024-08-12
+
+### Added
+
+- Added prev_randao field
+
+### Changed
+
+- Revert Metadata flattening
+
+### Fixed
+
+- Fixed response codes
+- Fixed version field
+
 ## [0.8.0] - 2024-04-23
 
 ### Added
@@ -91,7 +106,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [0.2.0]
 - [0.1.0]
 
-[unreleased]: https://github.com/cartesi/openapi-interfaces/compare/v0.8.0...HEAD
+[unreleased]: https://github.com/cartesi/openapi-interfaces/compare/v0.9.0...HEAD
+[0.9.0]: https://github.com/cartesi/openapi-interfaces/releases/tag/v0.9.0
 [0.8.0]: https://github.com/cartesi/openapi-interfaces/releases/tag/v0.8.0
 [0.7.3]: https://github.com/cartesi/openapi-interfaces/releases/tag/v0.7.3
 [0.7.2]: https://github.com/cartesi/openapi-interfaces/releases/tag/v0.7.2