Parameter "TimeSlice" not to spec (seconds instead of milliseconds)

[NHQ]

The spec, and the inline comments of this module, indicate the "timeslice" parameter for the start method should be in milliseconds. This module expects the value in seconds.

Here is line converting timeslice to milliseconds from seconds: https://github.com/kbumsik/opus-media-recorder/blob/master/src/OpusMediaRecorder.js#L362