c,python: Change the algorithm for hashing the master password to Argon2

python/passgeny/passgeny.py

@@ -3,7 +3,6 @@
 #
 import argon2
 import argparse
-import hashlib
 import re
 
 from . import bhash, phogen
@@ -33,7 +32,7 @@ class PassgenyInvalidPattern(Exception):
 
 class Passgeny:
     def __init__(self, master_password):
-        self.master_password = hashlib.sha256(master_password.encode()).digest()
+        self.master_password = self.__argon2_hash(master_password.encode())
         self.pattern = PASSGENY_DEFAULT_PATTERN
 
     def generate(self, domain, user, *tokens):