Fix compat types

[marvinhagemeister]

Fixes #1751 .

cc to our typings god @pmkroeker

[coveralls]

Coverage increased (+0.1%) to 99.882% when pulling 43bb2e6 on compat_types into fed42bb on master.

[weijarz]

Does CreateHandle also need to be parameterized?

type CreateHandle<T> = () => T;

export function useImperativeHandle<T>(ref: PreactRef<T>, create: CreateHandle<T>, inputs?: Inputs): void;

[JoviDeCroock]

Just a little remark about the typings the rest looks great!