setup.py: Add more Trove classifiers
setup.py: Add more Trove classifiers

Add our supported (natural) languages and Python 3.5 & 3.6, also add
another Topic classifier which seemed appropriate.

suutari-ai/shoop,suutari-ai/shoop,suutari-ai/shoop,shoopio/shoop,shoopio/shoop,shoopio/shoop