[NEW] security/py-argon2-cffi: Secure Argon2 password hashing algorithm

Argon2 won the Password Hashing Competition and argon2_cffi is the simplest
way to use it in Python and PyPy:

passlib 1.7.0 and later offers Argon2 support using this library too.

WWW: https://argon2-cffi.readthedocs.io/