make setup.py py2 compatible again

package meta changes

updating changelog and version numbering for release

Tag 4.0.0a4

Tag v4.0.0a2

4.0.0a1

Tag v3.4.0

This is likely the last release in the 3.x series
4.0.0a1 is where any new development will happen

Version 3.3.2 to address a couple issues

Fixes #204.

Just a point release to address the issue for now.
Replacing argparse is already covered in #165 for 3.4