Missing ScryptParams bug

Created by: zicmama

File "create_public_key.py", line 15, in key = SigningKey(salt, password) TypeError: init() missing 1 required positional argument: 'scrypt_params'

Created by: coveralls

Coverage remained the same at 86.025% when pulling 7f9d039e on zicmama:patch-2 into 1289d74d on duniter:master.

added Crypto label