Added 5.0.0 entry to the CHANGELOG
Added 5.0.0 entry to the CHANGELOG

bvaughn/react-virtualized,cesarandreu/react-virtualized,bvaughn/react-virtualized,cesarandreu/react-virtualized,nicholasrq/react-virtualized,edulan/react-virtualized,nicholasrq/react-virtualized,edulan/react-virtualized