Add a note to the changelog about the addon upgrade
Add a note to the changelog about the addon upgrade

Closes https://github.com/emberjs/data/issues/3921
davidpett/data,tarzan/data,rtablada/data,davidpett/data,courajs/data,davidpett/data,nickiaconis/data,nickiaconis/data,HeroicEric/data,tarzan/data,arenoir/data,ryanpatrickcook/data,tarzan/data,ryanpatrickcook/data,workmanw/data,workmanw/data,rtablada/data,workmanw/data,ryanpatrickcook/data,ryanpatrickcook/data,workmanw/data,courajs/data,rtablada/data,wecc/data,HeroicEric/data,nickiaconis/data,swarmbox/data,swarmbox/data,rtablada/data,arenoir/data,HeroicEric/data,wecc/data,wecc/data,nickiaconis/data,courajs/data,swarmbox/data,tarzan/data,arenoir/data,HeroicEric/data,courajs/data,arenoir/data,swarmbox/data,davidpett/data,wecc/data