📝 Update release notes

docs/release-notes.md

@@ -1,5 +1,6 @@
 ## Latest changes
 
+* Fix implementation for `skip_defaults` when returning a Pydantic model. PR [#422](https://github.com/tiangolo/fastapi/pull/422) by [@dmontagu](https://github.com/dmontagu).
 * Fix OpenAPI generation when using the same dependency in multiple places for the same *path operation*. PR [#417](https://github.com/tiangolo/fastapi/pull/417) by [@dmontagu](https://github.com/dmontagu).
 * Allow having empty paths in *path operations* used with `include_router` and a `prefix`.
     * This allows having a router for `/cats` and all its *path operations*, while having one of them for `/cats`.