Deprecation warning

[Richard van der Klooster]

I see the following deprecation warning in Python 3.5.2:

python3.5/site-packages/memoize/__init__.py:28: DeprecationWarning: inspect.getargspec() is deprecated, use inspect.signature() instead argspec = inspect.getargspec(f)

[John Carter]

See #24 for a potential fix for this

[Richard van der Klooster]

@therefromhere thanks, indeed the same issue.

Closing this as duplicate of #24