[docs] Adding SortedListField fix to changelog
[docs] Adding SortedListField fix to changelog

ms5/mongoengine,Catstyle/mongoengine,larsbutler/mongoengine,losintikfos/mongoengine,nicolascine/mongoengine,9nix00/mongoengine,starsirius/mongoengine,yarneo/mongoengine,cogniteev/mongoengine,jimmyshen/mongoengine,blaggacao/mongoengine,RussellLuo/mongoengine,Davidrjx/mongoengine,iandd0824/mongoengine,gavincabbage/mongoengine,WingGao/mongoengine,gmacon/mongoengine,Davidrjx/mongoengine,cogniteev/mongoengine,prijindal/mongoengine,touilleMan/mongoengine,DavidBord/mongoengine,sourcelair/mongoengine,MakerReduxCorp/mongoengine,khallaghi/mongoengine,MakerReduxCorp/mongoengine,ConsumerPhysics/mongoengine,ProgressivePlanning/mongoengine,eli-b/mongoengine,muhammad-ammar/mongoengine,reallistic/mongoengine,MRigal/mongoengine,nathanial/mongoengine,MongoEngine/mongoengine