Switch to `pkgutil namespace technique <https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_ for the ``jaraco`` namespace.
1.5.2
=====
Repair incorrect form of namespace package.
1.5.1
=====
Refresh distribution package.
1.5
===
Allow log level to be passed on the command-line as a numeric value as well.