Support python3.11

[PyHedgehog]

In python3.11 inspect.getargspec removed at last (after deprecation in 3.0).
Proposed fix:

try:
    from inspect import getargspec
except ImportError:
    from inspect import getfullargspec
    def getargspec(f):
        return tuple(getfullargspec(f))[:4]

[Murtadha]

I was just wondering about the sort of error I was getting when running ntfy.
Now it makes sense, because I was using Python 3.11

I hope this is fixed in an upcoming release.