Just pip install setuptools on AppVeyor
Just pip install setuptools on AppVeyor

Use the get-pip script to bootstrap pip and setuptools to pinned
versions for Python 3.2 compatibility.

PyPy3's latest Windows version only supports Python 3.2, so while Python
3.2 is EOL upstream, we're still testing against it and need to be able
to install our tooling (including pip and setuptools).

PyCQA/pyflakes,jayvdb/pyflakes,pyflakes/pyflakes,asmeurer/pyflakes