Update tests for changes in `@types/unist`
Update tests for changes in `@types/unist`

Reviewed-by: Christian Murphy <87443399f33738b7ca84788ff25901f64eee28bb@gmail.com>
Reviewed-by: Titus Wormer <5a19dbfdb793ef6d212461b3c03b23ad19ae3ed1@gmail.com>

Closes GH-28.
wooorm/unist-util-visit,wooorm/mdast-util-visit