Add note that `EL Capitan` is not yet supported
Add note that `EL Capitan` is not yet supported

MCGallaspy/installers,mrpau/installers,learningequality/ka-lite-installers,ruimalheiro/installers,ruimalheiro/installers,learningequality/ka-lite-installers,learningequality/installers,benjaoming/installers,learningequality/installers,learningequality/ka-lite-installers,mrpau/installers,mrpau/installers,benjaoming/installers,benjaoming/installers,MCGallaspy/installers,benjaoming/installers,learningequality/ka-lite-installers,ruimalheiro/installers,learningequality/installers,ruimalheiro/installers,MCGallaspy/installers,learningequality/installers,MCGallaspy/installers,mrpau/installers