Javascript-SDK - 4.2.0
### New Features
- Better offline support in React Native apps:
- Persist downloaded datafiles in local storage for use in subsequent SDK initializations ([#430](https://github.com/optimizely/javascript-sdk/pull/430))
- Persist pending impression & conversion events in local storage ([#517](https://github.com/optimizely/javascript-sdk/pull/517), [#532](https://github.com/optimizely/javascript-sdk/pull/532))
### Bug fixes
- Fixed log messages for Targeted Rollouts ([#515](https://github.com/optimizely/javascript-sdk/pull/515))
https://github.com/optimizely/javascript-sdk/releases/tag/v4.2.0
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