docs: updated changelog

Author: glennsl

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Change `Set.add` to not return self, to indicate that it's mutable. https://github.com/rescript-association/rescript-core/pull/35
 - Change `Iterator` bindings to have the same shape as `AsyncIterator` for consistency. https://github.com/rescript-association/rescript-core/pull/34
 - Add `Iterator.toArray` binding for turning an iterator into an array. https://github.com/rescript-association/rescript-core/pull/34
+- Fixed type signatures of `Array.fromArrayLikeWithMap` and `Array.fromIteratorWithMap`. https://github.com/rescript-association/rescript-core/pull/50
 
 ### Documentation