Python 3.5 compatibility broken

I’m not sure if this was done on purpose or not, but 5cdd5c4ba5cba5fc41508c2866ebcb37e46c6140 included changes that are not compatible with Python 3.5:

builtins.SyntaxError: invalid syntax (client.py, line 53)

I believe the comma at the end of **kwargs is invalid.

Code Version

6.4.0

Expected Behavior

6.4.0 should either work on Python 3.5 or not install on Python 3.5.

Current Behavior

Trying to use pysaml2 on Python 3.5 errors.

Possible Solution

• Use python_requires in setup.py / setup.cfg to state that pysaml2 does not support Python 3.5.
• Fix the syntax error so Python 3.5 can use pysaml2.

Steps to Reproduce

Using Python 3.5:

>>> from saml2.client import Saml2Client
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/clokep/.pyenv/versions/synapse-3.5/lib/python3.5/site-packages/saml2/client.py", line 53
    **kwargs,
            ^
SyntaxError: invalid syntax

[clokep]

Thanks for responding! It would be nice to update the python_requires for setuptools to understand this and error when trying to install pysaml2 (instead of getting a runtime error when trying to use it).

[clokep]

Thank you for the quick fix!