Javascript-SDK - 4.0.0-rc.1

## [4.0.0-rc.1] - April 17, 2020

### 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