docs: update changelog

Author: glennsl

Diff for: CHANGELOG.md

@@ -12,6 +12,7 @@
 - Fixed type signatures of `Array.fromArrayLikeWithMap` and `Array.fromIteratorWithMap`. https://github.com/rescript-association/rescript-core/pull/50
 - Remove internal async/await helpers that do not need to be exposed in `Core`.
 - Add locale and formatting options to `localeDateString`, `localeString` and `localTimeString` functions https://github.com/rescript-association/rescript-core/pull/30
+- Add `some`, `flat`, `expect`, `zip` and `or` to `Option`, deprecate `orElse`.
 
 ### Documentation