docs(changelog): update changelog for array additions

Author: glennsl

CHANGELOG.md

@@ -18,6 +18,9 @@
 - Change `Float.fromString` signature. Now accepts only string. https://github.com/rescript-association/rescript-core/pull/54
 - Change `Float.parseFloat` signature. Now accepts only string. https://github.com/rescript-association/rescript-core/pull/54
 - Add `getExn`, `getUnsafe`, `getWithDefault`, `map`, `mapWithDefault` and `flatMap` to `Nullable`. https://github.com/rescript-association/rescript-core/pull/67
+- Add `make`, `fromInitializer`, `findMap`, `keepSome`, `reduceRight` and `reduceRightWithIndex`. https://github.com/rescript-association/rescript-core/pull/49
+- Remove `reduceReverse` in favor of `reduceRight`. https://github.com/rescript-association/rescript-core/pull/49
+- Fixed type signatures of `reduce` and `reduceWithIndex`. https://github.com/rescript-association/rescript-core/pull/49
 
 ### Documentation