CHANGELOG.md: Upgrade artik710 to Poky Morty
CHANGELOG.md: Upgrade artik710 to Poky Morty

Signed-off-by: Michal Mazurek <a2df1e659c9fd2578de0a26565357cb273292eeb@resin.io>

resin-os/resin-artik710,resin-os/resin-artik710