Python 3.9 DeprecationWarning on "not NotImplemented" evaluation in handlers/bcrypt.py
When I use passlib on Python 3.9.0rc1, I get the following deprecation warning: ``` passlib/handlers/bcrypt.py:378: builtins.DeprecationWarning: NotImplemented should not be used in a boolean context ``` The code that triggers it is the middle line in this fragment: ```py result = safe_verify("test", test_hash_20) if not result: raise RuntimeError("%s incorrectly rejected $2$ hash" % backend) ```
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