Update changelog

Author: davidpdrsn

tower-http/CHANGELOG.md

@@ -24,10 +24,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Fixed
 
-- None.
+- Don't include identity in Content-Encoding header ([#317])
 
 [#290]: https://github.com/tower-rs/tower-http/pull/290
 [#283]: https://github.com/tower-rs/tower-http/pull/283
+[#317]: https://github.com/tower-rs/tower-http/pull/317
 
 # 0.3.5 (December 02, 2022)