fix: SafeConfigParser renamed to ConfigParser

[zetxx]

after latest system update this error has popped up:

archey3:862: DeprecationWarning: The SafeConfigParser class has been renamed to ConfigParser in Python 3.2. This alias will be removed in future versions. Use ConfigParser directly instead.
  config = ArcheyConfigParser()
Traceback (most recent call last):
  File "/usr/bin/archey3", line 805, in parse_display
    raise StopIteration
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/bin/archey3", line 869, in <module>
    main()
  File "/usr/bin/archey3", line 866, in main
    archey.run(options.screenshot)
  File "/usr/bin/archey3", line 728, in run
    print(self.render())
  File "/usr/bin/archey3", line 734, in render
    results = self.prepare_results()
  File "/usr/bin/archey3", line 753, in prepare_results
    for cls_name, args in self.parse_display():
RuntimeError: generator raised StopIteration

[tomswartz07]

I would argue that this shouldn't be removed, but just changed to return

[zetxx]

im not keen with python, so let author decide

[lclarkmichalek]

I think this is fine.