Javascript-SDK - 4.0.0-rc.1
### New Features
- ES module entry point for the browser - `"module"` property of `package.json` points to `dist/optimizely.browser.es.min.js` ([#445](https://github.com/optimizely/javascript-sdk/pull/445))
### Breaking Changes:
- Dropped support for Node.js version <8 ([#456](https://github.com/optimizely/javascript-sdk/pull/456))
### Bug fixes
- Node.js datafile manager uses gzip,deflate compression for requests ([#456](https://github.com/optimizely/javascript-sdk/pull/456))
https://github.com/optimizely/javascript-sdk/releases/tag/v4.0.0-rc.1
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