Updated to newer Ubuntu that supports Python 3.7
Updated to newer Ubuntu that supports Python 3.7

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