Add reverse prop

[astgermain]

Animations can easily be reversed for cleanup using state to set the value of a reverse prop and is already implemented but it is not stated in documentation even though it works.

Example:

const [shown, setShown] = useState(false)
const yeetMenu = () => {
    setShown(!shown)
}
<Slide
      duration={500}
      triggerOnce={true}
      direction="right"
      reverse={shown}
> 
<nav>Menu</nav>
<button onClick={yeetMenu}>Close</button>
</Slide>

I couldn't figure out any other way of implementing this feature if it already was it was unclear.