Move new changes under "Breaking Changes"

Author: yavorona

packages/optimizely-sdk/CHANGELOG.MD

@@ -10,11 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [4.0.0-alpha.1] - March 4, 2020
 
 ### Breaking Changes:
-- Removed `Promise` polyfill from browser entry point ([417](https://github.com/optimizely/javascript-sdk/pull/417))
-
-### New Features
-
- - Changed functionality of JSON schema validation in all entry points ([442](https://github.com/optimizely/javascript-sdk/pull/442)).
+- Removed `Promise` polyfill from browser entry point ([417](https://github.com/optimizely/javascript-sdk/pull/417)).
+- Changed functionality of JSON schema validation in all entry points ([442](https://github.com/optimizely/javascript-sdk/pull/442)).
    - Previously, `skipJSONValidation` flag was used by the user to specify whether the JSON object should be validated.
    - Now, `skipJSONValidation` has been removed entirely from all entry points. Instead, a user will need to import `jsonSchemaValidator` from `@optimizely/optimizely-sdk/lib/utils/json_schema_validator` and pass it to `createInstance` to perform validation as shown below: