fix(README): add pip install
fix(README): add pip install

Let people quickly install from pip. On OSX I think the deps are messed up since keyring needs to be installed first.
coreypobrien/supernova,swyytch/supernova,lmaycotte/supernova,coreypobrien/supernova,badcure/supernova,major/supernova,roaet/supernova,swyytch/supernova,roaet/supernova,lmaycotte/supernova,immanetize/supernova,major/supernova,immanetize/supernova,badcure/supernova