update CHANGELOG.md

CHANGELOG.md

@@ -6,6 +6,21 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 Version numbering in this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).  We aim to keep the core solver functionality and minor releases in sync between the Rust/Python and Julia implementations.  Small fixes that affect one implementation only may result in the patch release versions differing.
 
+## [0.9.0] - 2024-01-06
+
+- ## What's Changed
+- Read/write problems to JSON files [#111](https://github.com/oxfordcontrol/Clarabel.rs/pull/111)
+
+## Rust specific changes
+- validation tools for solver settings [#113](https://github.com/oxfordcontrol/Clarabel.rs/pull/113)
+
+- adds feature to include supernodal LDL solver from `faer-rs` [#112](https://github.com/oxfordcontrol/Clarabel.rs/pull/112)
+
+- Add wasm feature by @alexarice in [#114](https://github.com/oxfordcontrol/Clarabel.rs/pull/114)
+- pypi and testpypi build updates by @tschm in [#110](https://github.com/oxfordcontrol/Clarabel.rs/pull/110), [#115](https://github.com/oxfordcontrol/Clarabel.rs/pull/115), [#109](https://github.com/oxfordcontrol/Clarabel.rs/pull/109)
+
+
+
 ## [0.8.1] - 2024-21-05
 ### Changed 
 
@@ -143,6 +158,7 @@ offline against the Julia-based benchmark problem suite, but this will not appea
 
 - Ported all documentation to the common site [here](https://github.com/oxfordcontrol/ClarabelDocs)
 
+[0.9.0]: https://github.com/oxfordcontrol/Clarabel.rs/compare/v0.8.1...v0.9.0
 [0.8.1]: https://github.com/oxfordcontrol/Clarabel.rs/compare/v0.8.0...v0.8.1
 [0.8.0]: https://github.com/oxfordcontrol/Clarabel.rs/compare/v0.7.1...v0.8.0
 [0.7.1]: https://github.com/oxfordcontrol/Clarabel.rs/compare/v0.7.0...v0.7.1