CHANGELOG.md: Add entry for switching to Poky version sumo-19.0.0
CHANGELOG.md: Add entry for switching to Poky version sumo-19.0.0

Signed-off-by: Florin Sarbu <3a837a37a2ac9072a088641ec330e0e5d5b86f4e@resin.io>

resin-os/resin-edison,resin-os/resin-edison,resin-os/resin-edison