Revert "Remove no longer existing flag from README"
Revert "Remove no longer existing flag from README"

This reverts commit b67e51ba43d3088b30dccb4999269d1908c6a716.

blue-shell/carbon-gtk,blueshell-next/carbon-gtk,blue-shell/carbon-gtk,KDE/oxygen-gtk,KDE/oxygen-gtk,blueshell-next/carbon-gtk