Fix instructions on building a new release
Fix instructions on building a new release

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