Append Python 3 classifier to setup.py

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Update year of copyright

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
increase version and update documents

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>