cleanup readme to include a working example
cleanup readme to include a working example

nathforge/pyotp,uchuugaka/pyotp,jamesob/pyotp,selboo/pyotp,shaiguitar/rotp,fkeet/pyotp,HaloZero/pyotp,allerin/rotp,mdp/rotp,pombredanne/pyotp,brunovianarezende/pyotp,vveliev/rotp,shaiguitar/rotp