Add changelog for 0.16.9
Add changelog for 0.16.9

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