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jstasiak 
Fix typing-related TypeError

Older typing versions don't allow what we did[1]. We don't really need
to be that precise here anyway.

The error:

    $ python
    Python 3.5.2 (default, Nov 23 2017, 16:37:01)
    [GCC 5.4.0 20160609] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import zeroconf
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/scraper/venv/lib/python3.5/site-packages/zeroconf.py", line 320, in <module>
        OptionalExcInfo = Tuple[Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]]
      File "/usr/lib/python3.5/typing.py", line 649, in __getitem__
        return Union[arg, type(None)]
      File "/usr/lib/python3.5/typing.py", line 552, in __getitem__
        dict(self.__dict__), parameters, _root=True)
      File "/usr/lib/python3.5/typing.py", line 512, in __new__
        for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
      File "/usr/lib/python3.5/typing.py", line 512, in <genexpr>
        for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
      File "/usr/lib/python3.5/typing.py", line 1077, in __subclasscheck__
        if super().__subclasscheck__(cls):
      File "/usr/lib/python3.5/abc.py", line 225, in __subclasscheck__
        for scls in cls.__subclasses__():
    TypeError: descriptor '__subclasses__' of 'type' object needs an argument

Closes #141
Fixes: 1f33c4f8a805 ("Introduce some static type analysis to the codebase")

[1] https://github.com/python/typing/issues/266

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