📝 Update release notes

docs/en/docs/release-notes.md

@@ -2,6 +2,7 @@
 
 ## Latest changes
 
+* Add docs about [Async Tests](https://fastapi.tiangolo.com/advanced/async-tests/). PR [#1619](https://github.com/tiangolo/fastapi/pull/1619) by [@empicano](https://github.com/empicano).
 * Raise an exception when using form data (`Form`, `File`) without having `python-multipart` installed.
     * Up to now the application would run, and raise an exception only when receiving a request with form data, the new behavior, raising early, will prevent from deploying applications with broken dependencies.
     * It also detects if the correct package `python-multipart` is installed instead of the incorrect `multipart` (both importable as `multipart`).