Hi! And thank you for this very useful crate :-)

In the notify crate, unless the github search fails me, only MacOS (fsevent) really needs the bitflags crate today. So if that observation is correct, I'd suggest to make it a MacOS-only dependency.

bitflags v2 was released, so this might help some setups (Windows & BSD, I guess, since inotify depends on bitflags v1 in its public API, so might be more difficult to upgrade) to drop bitflags v1.