py-pathlib2: updated to 2.3.2

Version 2.3.2
- Hotfix for broken setup.py.

Version 2.3.1
- Fix tests for systems where filesystem encoding only supports ascii.
- Use modern setuptools syntax for specifying conditional scandir
  dependency.
- Remove legacy use of support module from old pathlib module.
  This fixes the tests for Python 3.6.
- Drop the "from __future__ import unicode_literals" and -Qnew tests
  as it introduced subtle bugs in the tests, and maintaining separate
  test modules for these legacy features seems not worth the effort.
- Drop Python 3.2 support, as scandir no longer supports it.

(adam)