Javascript-SDK - 4.3.0
### New Features
- Added support for version audience evaluation ([#517](https://github.com/optimizely/javascript-sdk/pull/571))
- Add datafile accessor ([#564](https://github.com/optimizely/javascript-sdk/pull/564))
https://github.com/optimizely/javascript-sdk/releases/tag/v4.3.0
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