Add to classifiers supported python versions
Add to classifiers supported python versions

It will help those people who will do some version compatability
checking with officially recomended tool **caniusepython3** which
looks exactly into classifiers to detect that an examined lib supports
Python 3.

itziakos/haas,scalative/haas,sjagoe/haas,scalative/haas,sjagoe/haas,itziakos/haas