Python 3: SecureKeyValues broken!!

[pfuntner]

The Python3 screwing continues:

$ SecureKeyValues.py -o test
Traceback (most recent call last):
  File "/home/jpfuntne/bin/SecureKeyValues.py", line 210, in <module>
    store = SecureKeyValues("test", "this is a test")
  File "/home/jpfuntne/bin/SecureKeyValues.py", line 95, in __init__
    self.key = base64.b64encode(hash.hexdigest())
  File "/usr/lib/python3.6/base64.py", line 58, in b64encode
    encoded = binascii.b2a_base64(s, newline=False)
TypeError: a bytes-like object is required, not 'str'

I'll revert it to Python 2 via 5c442df for now.