fix readme links
fix readme links

miaecle/deepchem,deepchem/deepchem,Agent007/deepchem,deepchem/deepchem,miaecle/deepchem,ktaneishi/deepchem,ktaneishi/deepchem,ktaneishi/deepchem,lilleswing/deepchem,peastman/deepchem,miaecle/deepchem,Agent007/deepchem,lilleswing/deepchem,lilleswing/deepchem,Agent007/deepchem,peastman/deepchem