Include a changelog entry for replacing async_trait with AFIT/RPITIT

Author: ixmoyren

axum/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## alpha.1
 
+- **breaking:** Replace `async_trait` with `AFIT/RPITIT` ([#2308])
 - **breaking:** Require `Sync` for all handlers and services added to `Router`
   and `MethodRouter` ([#2473])
 - **breaking:** The tuple and tuple_struct `Path` extractor deserializers now check that the number of parameters matches the tuple length exactly ([#2931])
@@ -18,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **added:** Add support WebSockets over HTTP/2.
   They can be enabled by changing `get(ws_endpoint)` handlers to `any(ws_endpoint)`.
 
+[#2308]: https://github.com/tokio-rs/axum/pull/2308
 [#2473]: https://github.com/tokio-rs/axum/pull/2473
 [#2645]: https://github.com/tokio-rs/axum/pull/2645
 [#2931]: https://github.com/tokio-rs/axum/pull/2931