py-jaraco.classes: updated to 3.2.1

v3.2.1
======

Refreshed package metadata.

v3.2.0
======

Switched to native namespace for jaraco package.

v3.1.1
======

Packaging refresh and associated cleanups, including fix
for 4 (failing black check).

v3.1.0
======

``classproperty`` decorator now supplies a
``classproperty.Meta`` class. Classes that wish to have
a class property should derive from that metaclass. This
approach solves the unintended behavior of the property
only being set on a given instance. For compatibility, the
old behavior is retained if the metaclass is not used.

v3.0.0
======

Project now requires Python 3.6 or later.

2.0
===

Switch to `pkgutil namespace technique
<https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_
for the ``jaraco`` namespace.

(adam)