Update README.rst
Update README.rst
iModels/mbuild,tcmoore3/mbuild,Jonestj1/mbuild,sallai/mbuild,summeraz/mbuild,ctk3b/mbuild,Jonestj1/mbuild,summeraz/mbuild,ctk3b/mbuild,sallai/mbuild,tcmoore3/mbuild,iModels/mbuild