Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
+
+## [v0.9.0](https://github.com/lf-lang/lingua-franca/tree/v0.9.0) (2024-09-21)
+
+To change this text, edit notes/lingua-franca/v0.9.0.md in the release-notes repo.
+
+**🚀 New Features**
+
+- Colored highlighting of selected diagram edges [\#2324](https://github.com/lf-lang/lingua-franca/pull/2324) (@soerendomroes)
+
+**✨ Enhancements**
+
+- Changes in the Lingua Franca Language Server to support improvements in the VSCode extension [\#2370](https://github.com/lf-lang/lingua-franca/pull/2370) (@vinzbarbuto)
+
+**🔧 Fixes**
+
+- Improvements in decentralized coordination [\#2394](https://github.com/lf-lang/lingua-franca/pull/2394) (@edwardalee)
+- Prevent hanging on waiting for timeout time [\#2399](https://github.com/lf-lang/lingua-franca/pull/2399) (@edwardalee)
+
+**🧪 Tests**
+
+- Improvements in decentralized coordination [\#2394](https://github.com/lf-lang/lingua-franca/pull/2394) (@edwardalee)
+
+
+### Submodule [lf-lang/reactor-c](http://github.com/lf-lang/reactor-c)
+
+**✨ Enhancements**
+
+- Improvements to decentralized coordination [\#476](https://github.com/lf-lang/reactor-c/pull/476) (@edwardalee)
+
+**🔧 Fixes**
+
+- Improvements to decentralized coordination [\#476](https://github.com/lf-lang/reactor-c/pull/476) (@edwardalee)
+
+
+### Submodule [lf-lang/reactor-cpp](http://github.com/lf-lang/reactor-cpp)
+
+- No Changes
+
+
+### Submodule [lf-lang/reactor-rs](http://github.com/lf-lang/reactor-rs)
+
+- No Changes
+
+
 
 ## [v0.8.2](https://github.com/lf-lang/lingua-franca/tree/v0.8.2) (2024-08-02)