Update README.md

[the1mills]

Just to document how anymatch works with directories...geez why no docs before :(

thanks 👍 :)

[coveralls]

Coverage remained the same at 100.0% when pulling d785e22 on the1mills:patch-1 into 43f99be on es128:master.

[es128]

This is incorrect, those examples would match as true (when being used for an ignore setting you want to positively match on the things you want excluded).

It also seems like an example that wouldn't be all that helpful to people with typical use cases.

I've opened #16 with my take on how this could be presented for now.