[vm/ffi] Add Changelog for Array.elements change

Follow-up to https://dart-review.googlesource.com/c/sdk/+/414821

Bug: https://github.com/dart-lang/sdk/issues/45508
Change-Id: I46380486fb3758e2a99c829a33e3b75c96bfab52
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/423720
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Michael Goderbauer <goderbauer@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f54f90..d86d193 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,10 @@
   breaking change in 3.0.0 that removed the `registerElement` APIs. See
   [#53264](https://github.com/dart-lang/sdk/issues/53264) for details.
 
+#### `dart:ffi`
+
+- Added `Array.elements` which exposes an `Iterable` over the `Array`'s content.
+
 ### Tools
 
 #### Analyzer