Switch to `pkgutil namespace technique <https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_ for the ``jaraco`` namespace.
4.3
===
6: Avoid use of deperecated ``yield_fixture``.
4.2
===
Refresh package metadata.
4.1
===
Added PostgresDatabase.ensure_user, which will not fail if the user already exists. In PostgresServer.create, use ensure_user to allow multiple databases to be created using the same user.