update changelog

CHANGELOG.md

@@ -1,9 +1,20 @@
 # Changelog
 
+## v0.4.0
+
+- Updated [`Cast`](https://pkg.go.dev/github.com/studio-b12/elk#Cast) to make use of `errors.As` to unwrap errors.
+- Added [`ErrorResponseModel`](https://pkg.go.dev/github.com/studio-b12/elk#ErrorResponseModel) and [`ToErrorResponseModel`](https://pkg.go.dev/github.com/studio-b12/elk#ToErrorResponseModel).
+
+## v0.3.0
+
+- `Cast` does now handle joined errors created via [`errors.Join`](https://pkg.go.dev/errors#Join). See [the documentation](https://pkg.go.dev/github.com/studio-b12/[email protected]#Cast) for more information.
+- Fixed some typos in the code documentation.
+
 ## v0.2.0
 
 - Added function `WrapCopyCode`, which takes an error and–if it has an error code–copies the code to the new wrapped error.
 - Added formatted function alternatives `NewErrorf`, `Wrapf` and `WrapCopyCodef`
+
 ## v0.1.0
 
-- Initial preview release.
+- Initial preview release.