Javascript-SDK - 2.3.0

## [2.3.0] - November 14, 2018

### New Features * Allow sticky bucketing via passing in `attributes.$opt_experiment_bucket_map`, this more easily allows customers to do some async data fetching and ensure a user gets a specific variation.

```js const userId = '123' const expId = '456' const variationId = '678' const userAttributes = { $opt_experiment_bucket_map: { [expId]: { variation_id: variationId } } }

var selectedVariationKey = optimizelyClient.activate('experiment-1', userId, userAttributes); ```

https://github.com/optimizely/javascript-sdk/releases/tag/v2.3.0