abc.abstractproperty is deprecated since 3.3 #266

Locations:

1. importlib_resources/importlib_resources/simple.py

   Line 19 in 56c21cd

   @abc.abstractproperty

2. importlib_resources/importlib_resources/abc.py

   Line 142 in acfc5c9

   @abc.abstractproperty

Docs: https://docs.python.org/3/library/abc.html#abc.abstractproperty

Instead one should use:

@property 
@abc.abstractmethod
def ...

I will send a PR to change this to a new API. Maybe there are reasons why it should stay as-is?

Found in python/mypy#13647