Update CHANGELOG.md

Author: apcha-oai

CHANGELOG.md

@@ -10,6 +10,10 @@ Full Changelog: [v3.27.0...v3.28.0](https://github.com/openai/openai-go/compare/
 * **api:** add defer_loading field to function tools ([6d4b683](https://github.com/openai/openai-go/commit/6d4b6833e5b0b29a9b1d0c99062a231290e8b93f))
 * **api:** custom voices ([d00b782](https://github.com/openai/openai-go/commit/d00b782c32db4c953b8e39edc5a77504693c70f3))
 
+### ⚠ BREAKING CHANGES
+
+* **api:** The `voice` param and resouce has changed from a `string` to a `string | {id: string}`. This is a breaking change for Go.
+
 ## 3.27.0 (2026-03-13)
 
 Full Changelog: [v3.26.0...v3.27.0](https://github.com/openai/openai-go/compare/v3.26.0...v3.27.0)