Update chembl_graph_conv.py
Update chembl_graph_conv.py

Small fix
joegomes/deepchem,lilleswing/deepchem,Agent007/deepchem,peastman/deepchem,lilleswing/deepchem,miaecle/deepchem,deepchem/deepchem,peastman/deepchem,Agent007/deepchem,deepchem/deepchem,ktaneishi/deepchem,Agent007/deepchem,miaecle/deepchem,ktaneishi/deepchem,rbharath/deepchem,rbharath/deepchem,miaecle/deepchem,lilleswing/deepchem,ktaneishi/deepchem,joegomes/deepchem