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fix: fix return type for close (#410)

Summary:

- optimizely.close() does return a Promise. See [here](https://github.com/optimizely/javascript-sdk/blob/9fe10a04a/packages/optimizely-sdk/lib/optimizely/index.js#L977)
- [Docs](https://docs.developers.optimizely.com/full-stack/docs/event-batching-javascript-node#section-close-optimizely-on-application-exit) also mentions awaiting on close

Fixes `'await' has no effect on the type of this expression.ts(80007)`

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