Add unzip to pre-depends
Add unzip to pre-depends

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