Log Message:
py-zeroconf: updated to 0.28.4

0.28.4
Improved cache reaper performance significantly, thanks to J. Nick Koston.
Added ServiceListener to __all__ as it's part of the public API, thanks to \ 
Justin Nesselrotte.

0.28.3
Reduced a time an internal lock is held which should eliminate deadlocks in \ 
high-traffic networks, thanks to J. Nick Koston.

0.28.2
Stopped asking questions we already have answers for in cache, thanks to Paul \ 
Daumlechner.
Removed initial delay before querying for service info, thanks to Erik Montnemery.