Add upgradesFrom and downgradesTo fields for beta-cassandra (#1396)
Add upgradesFrom and downgradesTo fields for beta-cassandra (#1396)


aloismayr/universe,BuoyantIO/universe,aloismayr/universe,AppliedIS/universe,aloismayr/universe,mesosphere/universe,BuoyantIO/universe,mwl/universe,AppliedIS/universe,yuchaoran2011/universe,madanadit/universe,BuoyantIO/universe,mwl/universe,yuchaoran2011/universe,yuchaoran2011/universe,AppliedIS/universe,madanadit/universe,mesosphere/universe,madanadit/universe