Updated installation instructions to specify 2.3
Updated installation instructions to specify 2.3

miaecle/deepchem,miaecle/deepchem,peastman/deepchem,peastman/deepchem,lilleswing/deepchem,deepchem/deepchem,lilleswing/deepchem,lilleswing/deepchem,miaecle/deepchem,deepchem/deepchem