Wrong requirement in setup.py (elementtree)

[fedexcastro]

There is a requirement in the setup.py "elementree" that shouldn't be there since the library it's already part of the standard library. (http://stackoverflow.com/questions/34566142/cant-install-elementtree-with-pip)

I just prepared a pull request with the change.
#31

[mtalexan]

The project seems to be unmaintained. I've started a new fork with this fix in it as well as a number of others:
https://github.com/mtalexan/VersionOne.SDK.Python