Update CHANGES.md to note fix to column.set for subrows/columnsets
Update CHANGES.md to note fix to column.set for subrows/columnsets

maier49/dgrid,kfranqueiro/dgrid,dylans/dgrid,dylans/dgrid,kfranqueiro/dgrid,dylans/dgrid,maier49/dgrid,kfranqueiro/dgrid,maier49/dgrid