Add a 'reset' helper to reset the typing animation

[Seth-McKilla]

I'm using this package with framer-motion for a complex animation sequence and it would be great to have a helper to trigger a reset of the animation from the beginning.

const { isType, isDelete, isDelay, isDone, reset } = helper

I'd be happy to contribute this feature but it looks like it's been a while since there's been activity on this package; @awran5 are you still maintaining the repo / reviewing PR's? Thanks!