Zeroconf

- Fixed import-time "TypeError: 'ellipsis' object is not iterable." on
CPython 3.5.2

- Added support for AWDL interface on macOS (needed and used by the
opendrop project but should be useful in general), thanks to Milan
Stute
- Added missing type hints

- Applied some significant performance optimizations, thanks to Jaime
van Kessel for the patch and to Ghostkeeper for performance
measurements
- Fixed flushing outdated cache entries when incoming record is
unique, thanks to Michael Hu
- Fixed handling updates of TXT records (they'd not get recorded
previously), thanks to Michael Hu

- Added IPv6 support, thanks to Dmitry Tantsur
- Added additional recommended records to PTR responses, thanks to
Scott Mertz
- Added handling of ENOTCONN being raised during shutdown when using
Eventlet, thanks to Tamás Nepusz
- Included the py.typed marker in the package so that type checkers
know to use type hints from the source code, thanks to Dmitry
Tantsur

- Added support for MyListener call getting updates to service TXT
records, thanks to Matt Saxon
- Added support for multiple addresses when publishing a service,
getting/setting single address has become deprecated. Change thanks
to Dmitry Tantsur

Backwards incompatible:

- Dropped Python 3.4 support

- A lot of maintenance work (tooling, typing coverage and
improvements, spelling) done, thanks to Ville Skyttä
- Provided saner defaults in ServiceInfo's constructor, thanks to
Jorge Miranda
- Fixed service removal packets not being sent on shutdown, thanks to
Andrew Bonney
- Added a way to define TTL-s through ServiceInfo contructor
parameters, thanks to Andrew Bonney

Technically backwards incompatible:

- Adjusted query intervals to match RFC 6762, thanks to Andrew Bonney
- Made default TTL-s match RFC 6762, thanks to Andrew Bonney