changelog updated for 0.16.1 release
changelog updated for 0.16.1 release

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