Updated upgrade.rst
Updated upgrade.rst

blaggacao/mongoengine,Multiposting/mongoengine,MakerReduxCorp/mongoengine,closeio/mongoengine,prijindal/mongoengine,nathanial/mongoengine,elephanter/mongoengine,jimmyshen/mongoengine,hmarr/mongoengine,RussellLuo/mongoengine,nicolascine/mongoengine,reallistic/mongoengine,KarimAllah/mongoengine,9nix00/mongoengine,losintikfos/mongoengine,colinhowe/mongoengine,newvem/mongoengine,cogniteev/mongoengine,ProgressivePlanning/mongoengine,ConsumerPhysics/mongoengine,depop/mongoengine-stripped,MongoEngine/mongoengine,ContextLogic/mongoengine,touilleMan/mongoengine,noirbizarre/mongoengine,gavincabbage/mongoengine,sourcelair/mongoengine,conversocial/mongoengine,ms5/mongoengine,ContextLogic/mongoengine,muhammad-ammar/mongoengine,DavidBord/mongoengine,cogniteev/mongoengine,MRigal/mongoengine,larsbutler/mongoengine,eli-b/mongoengine,WingGao/mongoengine,yarneo/mongoengine,starsirius/mongoengine,Davidrjx/mongoengine,aszwemin/mongoengine,khallaghi/mongoengine,iandd0824/mongoengine,MakerReduxCorp/mongoengine,Davidrjx/mongoengine,Catstyle/mongoengine,gmacon/mongoengine