Run tests on prereleases of Python on Windows. Fixes jaraco/skeleton#17.
Run tests on prereleases of Python on Windows. Fixes jaraco/skeleton#17.

jaraco/keyring,jaraco/zipp,yougov/pmxbot,yougov/pmxbot,jaraco/jaraco.functools,pytest-dev/pytest-runner,jaraco/portend,jaraco/jaraco.itertools,jaraco/jaraco.text,jaraco/hgtools,jaraco/jaraco.classes,jaraco/jaraco.context,jaraco/tempora,yougov/pmxbot,pwdyson/inflect.py,jaraco/irc,jazzband/inflect,jaraco/jaraco.stream,jaraco/backports.functools_lru_cache,jaraco/jaraco.path,python/importlib_metadata,jaraco/calendra,jaraco/jaraco.collections,jaraco/jaraco.logging