Call.startPlayback has outdated typings

[Birdi7]

Argument types has changed in recent API
https://voximplant.com/docs/references/voxengine/voxengine/startplaybackoptions#progressiveplayback

ts-voxengine/src/Call.d.ts

Line 392 in cf5de92

startPlayback(url: string, loop: boolean): void;