Adds note about Python 3 (you should use Python 2)
Adds note about Python 3 (you should use Python 2)

Still waiting on https://github.com/jbardin/scp.py/pull/39

ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip