Neurite is incompatible with python 3.11 #76

Hi! I am trying to use neurite with python 3.11 and I noticed the following error:

attrs, varargs, varkw, defaults = inspect.getargspec(func)

which is cause by an incompatibility of inspect and python 3.11.

The issue can be resolved by changing the above line to:

attrs, varargs, varkw, defaults, _, _, _ = inspect.getfullargspec(func)

It would be nice to make neurite compatible with the newer python versions.

Thanks a lot!