chore(package): update mock-fs to version 3.9.0
chore(package): update mock-fs to version 3.9.0

https://greenkeeper.io/
bennett000/the-clusternator,rafkhan/the-clusternator,bennett000/the-clusternator,bennett000/the-clusternator,rafkhan/the-clusternator,rangle/the-clusternator,rangle/the-clusternator,rangle/the-clusternator