React-SDK - 2.3.0-beta
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## [2.3.0-beta] - August 27th, 2020 Upgrade `@optimizely/optimizely-sdk` to [4.2.1](https://github.com/optimizely/javascript-sdk/releases/tag/v4.2.1)
### New Features - `useExperiment` and `useFeature` hooks re-render when override user ID or attributes change([#64](https://github.com/optimizely/react-sdk/pull/64))
### Bug fixes - `useExperiment` and `useFeature` hooks return up-to-date decision values on the first call after the client is ready ([#64](https://github.com/optimizely/react-sdk/pull/64))