add implementation classifier to setup.py
add implementation classifier to setup.py

gvalkov/python-evdev,ProfessorKaos64/python-evdev,gcd0318/python-evdev,ProfessorKaos64/python-evdev,gvalkov/python-evdev,gcd0318/python-evdev,ProfessorKaos64/python-evdev,gcd0318/python-evdev