Javascript-SDK - 4.1.0-beta

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## [4.1.0-beta] - June 16, 2020

### New Features - Added support for JSON feature variables: new methods `getFeatureVariableJson` and `getAllFeatureVariables` ([#467](https://github.com/optimizely/javascript-sdk/pull/467), [#470](https://github.com/optimizely/javascript-sdk/pull/470)) - Added support for authenticated datafiles when running in Node.js. Pass `datafileAccessToken` within `datafileOptions` to request an authenticated datafile using the token ([#498](https://github.com/optimizely/javascript-sdk/pull/498), [#502](https://github.com/optimizely/javascript-sdk/pull/502)): ```js const optimizelySDK = require('@optimizely/optimizely-sdk'); var optimizelyClientInstance = optimizely.createInstance({ sdkKey: '', datafileOptions: { datafileAccessToken: '', } }); ```

### Bug fixes - Fixed audience evaluation log level: changed from `INFO` to `DEBUG` ([#496](https://github.com/optimizely/javascript-sdk/pull/496))