Changing python version to sync with repo version

I don't know [what you want to do about][1] the v0.4.2 tag, but for the pypi submission I changed the version number in setup.py to match the github repo tag.

I think we need to make a version release checklist and note where all the version numbers need to be recorded.

[1]: https://www.kernel.org/pub/software/scm/git/docs/git-tag.html#_on_re_tagging