update changelog from 0.18.6 to 0.19.0
update changelog from 0.18.6 to 0.19.0

Level/levelup,roppa/levelup,timkuijsten/levelup,timkuijsten/levelup,JTKnox91/levelup,JTKnox91/levelup,lastguest/levelup,roppa/levelup,djchie/levelup,toddself/levelup,djchie/levelup,lastguest/levelup,toddself/levelup