React-SDK - 2.1.0
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## [2.1.0] - July 8th, 2020 Upgrade `@optimizely/optimizely-sdk` to 4.1.0. See [@optimizely/optimizely-sdk Release 4.1.0](https://github.com/optimizely/javascript-sdk/releases/tag/v4.1.0) for more details.
## New Features - Add support for JSON feature variables ([#53](https://github.com/optimizely/react-sdk/pull/53))