[Sequelize] Added BelongsTo association mixin helper types.
[Sequelize] Added BelongsTo association mixin helper types.

nainslie/DefinitelyTyped,daptiv/DefinitelyTyped,rschmukler/DefinitelyTyped,lseguin42/DefinitelyTyped,syuilo/DefinitelyTyped,benishouga/DefinitelyTyped,olemp/DefinitelyTyped,florentpoujol/DefinitelyTyped,mattblang/DefinitelyTyped,opichals/DefinitelyTyped,rschmukler/DefinitelyTyped,nakakura/DefinitelyTyped,dmoonfire/DefinitelyTyped,syuilo/DefinitelyTyped,johan-gorter/DefinitelyTyped,sledorze/DefinitelyTyped,amir-arad/DefinitelyTyped,trystanclarke/DefinitelyTyped,optical/DefinitelyTyped,borisyankov/DefinitelyTyped,trystanclarke/DefinitelyTyped,minodisk/DefinitelyTyped,damianog/DefinitelyTyped,nmalaguti/DefinitelyTyped,chbrown/DefinitelyTyped,use-strict/DefinitelyTyped,mshmelev/DefinitelyTyped,benishouga/DefinitelyTyped,georgemarshall/DefinitelyTyped,dydek/DefinitelyTyped,Ptival/DefinitelyTyped,benishouga/DefinitelyTyped,laco0416/DefinitelyTyped,stephenjelfs/DefinitelyTyped,Litee/DefinitelyTyped,AgentME/DefinitelyTyped,wcomartin/DefinitelyTyped,KonaTeam/DefinitelyTyped,arcticwaters/DefinitelyTyped,dsebastien/DefinitelyTyped,UzEE/DefinitelyTyped,Dominator008/DefinitelyTyped,greglo/DefinitelyTyped,subash-a/DefinitelyTyped,benliddicott/DefinitelyTyped,wilfrem/DefinitelyTyped,zuzusik/DefinitelyTyped,gandjustas/DefinitelyTyped,pocesar/DefinitelyTyped,aindlq/DefinitelyTyped,bridge-ufsc/DefinitelyTyped,RedSeal-co/DefinitelyTyped,ryan10132/DefinitelyTyped,bdoss/DefinitelyTyped,RX14/DefinitelyTyped,fredgalvao/DefinitelyTyped,lbesson/DefinitelyTyped,xStrom/DefinitelyTyped,smrq/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,Karabur/DefinitelyTyped,mshmelev/DefinitelyTyped,adamcarr/DefinitelyTyped,gcastre/DefinitelyTyped,flyfishMT/DefinitelyTyped,gyohk/DefinitelyTyped,philippstucki/DefinitelyTyped,philippstucki/DefinitelyTyped,schmuli/DefinitelyTyped,zalamtech/DefinitelyTyped,esperco/DefinitelyTyped,martinduparc/DefinitelyTyped,giggio/DefinitelyTyped,nabeix/DefinitelyTyped,aciccarello/DefinitelyTyped,hellopao/DefinitelyTyped,mhegazy/DefinitelyTyped,shlomiassaf/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,gcastre/DefinitelyTyped,tan9/DefinitelyTyped,nitintutlani/DefinitelyTyped,arusakov/DefinitelyTyped,AyaMorisawa/DefinitelyTyped,alexdresko/DefinitelyTyped,gyohk/DefinitelyTyped,zuzusik/DefinitelyTyped,martinduparc/DefinitelyTyped,TrabacchinLuigi/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,rolandzwaga/DefinitelyTyped,ashwinr/DefinitelyTyped,sandersky/DefinitelyTyped,algorithme/DefinitelyTyped,munxar/DefinitelyTyped,alvarorahul/DefinitelyTyped,ashwinr/DefinitelyTyped,jraymakers/DefinitelyTyped,bridge-ufsc/DefinitelyTyped,applesaucers/lodash-invokeMap,emanuelhp/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,davidpricedev/DefinitelyTyped,georgemarshall/DefinitelyTyped,bilou84/DefinitelyTyped,mjjames/DefinitelyTyped,danfma/DefinitelyTyped,takenet/DefinitelyTyped,Dashlane/DefinitelyTyped,dsebastien/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,mattanja/DefinitelyTyped,sledorze/DefinitelyTyped,arusakov/DefinitelyTyped,raijinsetsu/DefinitelyTyped,Penryn/DefinitelyTyped,alextkachman/DefinitelyTyped,jasonswearingen/DefinitelyTyped,paulmorphy/DefinitelyTyped,scriby/DefinitelyTyped,vasek17/DefinitelyTyped,behzad888/DefinitelyTyped,smrq/DefinitelyTyped,mweststrate/DefinitelyTyped,aciccarello/DefinitelyTyped,reppners/DefinitelyTyped,YousefED/DefinitelyTyped,YousefED/DefinitelyTyped,emanuelhp/DefinitelyTyped,egeland/DefinitelyTyped,esperco/DefinitelyTyped,sixinli/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,abner/DefinitelyTyped,ajtowf/DefinitelyTyped,AgentME/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,eugenpodaru/DefinitelyTyped,pwelter34/DefinitelyTyped,Bunkerbewohner/DefinitelyTyped,yuit/DefinitelyTyped,hellopao/DefinitelyTyped,progre/DefinitelyTyped,raijinsetsu/DefinitelyTyped,rcchen/DefinitelyTyped,vagarenko/DefinitelyTyped,mareek/DefinitelyTyped,davidpricedev/DefinitelyTyped,pwelter34/DefinitelyTyped,PopSugar/DefinitelyTyped,paulmorphy/DefinitelyTyped,newclear/DefinitelyTyped,alextkachman/DefinitelyTyped,martinduparc/DefinitelyTyped,psnider/DefinitelyTyped,bennett000/DefinitelyTyped,jimthedev/DefinitelyTyped,magny/DefinitelyTyped,hatz48/DefinitelyTyped,OpenMaths/DefinitelyTyped,mjjames/DefinitelyTyped,chrismbarr/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,UzEE/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,glenndierckx/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,Karabur/DefinitelyTyped,sergey-buturlakin/DefinitelyTyped,Syati/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,EnableSoftware/DefinitelyTyped,jsaelhof/DefinitelyTyped,aciccarello/DefinitelyTyped,micurs/DefinitelyTyped,nycdotnet/DefinitelyTyped,elisee/DefinitelyTyped,behzad888/DefinitelyTyped,mattblang/DefinitelyTyped,nmalaguti/DefinitelyTyped,mareek/DefinitelyTyped,nobuoka/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,mattanja/DefinitelyTyped,HPFOD/DefinitelyTyped,isman-usoh/DefinitelyTyped,schmuli/DefinitelyTyped,Syati/DefinitelyTyped,jraymakers/DefinitelyTyped,nakakura/DefinitelyTyped,gandjustas/DefinitelyTyped,MugeSo/DefinitelyTyped,johan-gorter/DefinitelyTyped,tan9/DefinitelyTyped,egeland/DefinitelyTyped,borisyankov/DefinitelyTyped,fredgalvao/DefinitelyTyped,nycdotnet/DefinitelyTyped,sergey-buturlakin/DefinitelyTyped,applesaucers/lodash-invokeMap,jbrantly/DefinitelyTyped,Litee/DefinitelyTyped,subjectix/DefinitelyTyped,Ptival/DefinitelyTyped,pocesar/DefinitelyTyped,arusakov/DefinitelyTyped,nainslie/DefinitelyTyped,stacktracejs/DefinitelyTyped,psnider/DefinitelyTyped,erosb/DefinitelyTyped,BrandonCKrueger/DefinitelyTyped,iCoreSolutions/DefinitelyTyped,TrabacchinLuigi/DefinitelyTyped,georgemarshall/DefinitelyTyped,pocesar/DefinitelyTyped,herrmanno/DefinitelyTyped,QuatroCode/DefinitelyTyped,optical/DefinitelyTyped,AgentME/DefinitelyTyped,magny/DefinitelyTyped,nobuoka/DefinitelyTyped,shlomiassaf/DefinitelyTyped,omidkrad/DefinitelyTyped,EnableSoftware/DefinitelyTyped,onecentlin/DefinitelyTyped,use-strict/DefinitelyTyped,moonpyk/DefinitelyTyped,HPFOD/DefinitelyTyped,hellopao/DefinitelyTyped,Zorgatone/DefinitelyTyped,one-pieces/DefinitelyTyped,RX14/DefinitelyTyped,mcrawshaw/DefinitelyTyped,vagarenko/DefinitelyTyped,evandrewry/DefinitelyTyped,florentpoujol/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,wilfrem/DefinitelyTyped,AyaMorisawa/DefinitelyTyped,damianog/DefinitelyTyped,rolandzwaga/DefinitelyTyped,nelsonmorais/DefinitelyTyped,timjk/DefinitelyTyped,mcliment/DefinitelyTyped,amanmahajan7/DefinitelyTyped,musicist288/DefinitelyTyped,dydek/DefinitelyTyped,danfma/DefinitelyTyped,jasonswearingen/DefinitelyTyped,nitintutlani/DefinitelyTyped,arma-gast/DefinitelyTyped,whoeverest/DefinitelyTyped,axelcostaspena/DefinitelyTyped,abbasmhd/DefinitelyTyped,chrootsu/DefinitelyTyped,newclear/DefinitelyTyped,dflor003/DefinitelyTyped,Zzzen/DefinitelyTyped,greglo/DefinitelyTyped,takenet/DefinitelyTyped,teves-castro/DefinitelyTyped,richardTowers/DefinitelyTyped,Pro/DefinitelyTyped,ryan-codingintrigue/DefinitelyTyped,jimthedev/DefinitelyTyped,frogcjn/DefinitelyTyped,glenndierckx/DefinitelyTyped,ciriarte/DefinitelyTyped,Dominator008/DefinitelyTyped,minodisk/DefinitelyTyped,markogresak/DefinitelyTyped,scriby/DefinitelyTyped,GlennQuirynen/DefinitelyTyped,bennett000/DefinitelyTyped,frogcjn/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,teves-castro/DefinitelyTyped,alvarorahul/DefinitelyTyped,Zorgatone/DefinitelyTyped,alexdresko/DefinitelyTyped,xStrom/DefinitelyTyped,onecentlin/DefinitelyTyped,reppners/DefinitelyTyped,Penryn/DefinitelyTyped,alainsahli/DefinitelyTyped,mhegazy/DefinitelyTyped,schmuli/DefinitelyTyped,stephenjelfs/DefinitelyTyped,donnut/DefinitelyTyped,hatz48/DefinitelyTyped,AgentME/DefinitelyTyped,subash-a/DefinitelyTyped,stacktracejs/DefinitelyTyped,drinchev/DefinitelyTyped,amanmahajan7/DefinitelyTyped,mcrawshaw/DefinitelyTyped,jimthedev/DefinitelyTyped,sclausen/DefinitelyTyped,zuzusik/DefinitelyTyped,MugeSo/DefinitelyTyped,arma-gast/DefinitelyTyped,Zzzen/DefinitelyTyped,dmoonfire/DefinitelyTyped,ajtowf/DefinitelyTyped,olemp/DefinitelyTyped,donnut/DefinitelyTyped,OpenMaths/DefinitelyTyped,jsaelhof/DefinitelyTyped,nfriend/DefinitelyTyped,progre/DefinitelyTyped,georgemarshall/DefinitelyTyped,abner/DefinitelyTyped,isman-usoh/DefinitelyTyped,arcticwaters/DefinitelyTyped,flyfishMT/DefinitelyTyped,rcchen/DefinitelyTyped,OfficeDev/DefinitelyTyped,Gmulti/DefinitelyTyped,psnider/DefinitelyTyped,chrootsu/DefinitelyTyped,GlennQuirynen/DefinitelyTyped,drinchev/DefinitelyTyped,yuit/DefinitelyTyped,chrismbarr/DefinitelyTyped,elisee/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,bluong/DefinitelyTyped,QuatroCode/DefinitelyTyped,sclausen/DefinitelyTyped,Pro/DefinitelyTyped,abbasmhd/DefinitelyTyped,Dashlane/DefinitelyTyped,bdoss/DefinitelyTyped