I've installed library today and tried to run an example. Got this error:

Traceback (most recent call last):
File "single-thing.py", line 118, in
run_server()
File "single-thing.py", line 106, in run_server
server.start()
File "/usr/local/lib/python3.7/dist-packages/webthing/server.py", line 864, in start
server='{}.local.'.format(socket.gethostname()))
TypeError: init() got an unexpected keyword argument 'address'

Done some digging, checked the constructor of zeroconf ServiceInfo here:
https://github.com/jstasiak/python-zeroconf/blob/master/zeroconf/__init__.py
and then changed the line number 859 in server.py from this

address=socket.inet_aton(get_ip()),

to this

addresses=[socket.inet_aton(get_ip())],

and then example started working as expected.

zeroconf version 0.27.0
ifaddr version 0.1.6
python version 3.7.3