update change log

Author: rkodev

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed a bug where collection/array of primitive types members for union/intersection types would be ignored. [#5283](https://github.com/microsoft/kiota/issues/5283)
 - Fixed a when generating a plugin when only an operation is selected in the root node in the extension. [#5300](https://github.com/microsoft/kiota/issues/5300)
+- Fix serialization of composed types in TypeScript. [#5353](https://github.com/microsoft/kiota/issues/5353)
 
 ## [1.18.0] - 2024-09-05