Add CHANGELOG entry for PR #455

Author: TofuWaffles

tower-http/CHANGELOG.md

@@ -9,7 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Added
 
-- None.
+- **trace:** Add default generic parameters for `ResponseBody` and `ResponseFuture` ([#455])
+- **trace:** Add type aliases `HttpMakeClassifier` and `GrpcMakeClassifier` ([#455])
 
 ## Changed
 
@@ -23,6 +24,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - None.
 
+[#455]: https://github.com/tower-rs/tower-http/pull/455
+
 # 0.5.0 (November 21, 2023)
 
 ## Changed