Added note that nvPY does not work on Python 3
Added note that nvPY does not work on Python 3

Thanks to Christian Tietze for the feedback!

dwu/nvpy,n8henrie/nvpy,bwillistower/nvpy,khornberg/nvpy-gtk,trankmichael/nvpy,dwu/nvpy,yuuki0xff/nvpy,yuuki0xff/nvpy