Added 'optgroups' option property in 'selectize'.
Added 'optgroups' option property in 'selectize'.

DzmitryDulko/DefinitelyTyped,nobuoka/DefinitelyTyped,ajtowf/DefinitelyTyped,Syati/DefinitelyTyped,rerezz/DefinitelyTyped,scriby/DefinitelyTyped,RX14/DefinitelyTyped,lbguilherme/DefinitelyTyped,martinduparc/DefinitelyTyped,bdoss/DefinitelyTyped,esperco/DefinitelyTyped,sandersky/DefinitelyTyped,nojaf/DefinitelyTyped,Riron/DefinitelyTyped,davidpricedev/DefinitelyTyped,onecentlin/DefinitelyTyped,magny/DefinitelyTyped,OpenMaths/DefinitelyTyped,Karabur/DefinitelyTyped,nainslie/DefinitelyTyped,Dashlane/DefinitelyTyped,reppners/DefinitelyTyped,newclear/DefinitelyTyped,wilfrem/DefinitelyTyped,one-pieces/DefinitelyTyped,zuzusik/DefinitelyTyped,frogcjn/DefinitelyTyped,AgentME/DefinitelyTyped,aldo-roman/DefinitelyTyped,OpenMaths/DefinitelyTyped,pocesar/DefinitelyTyped,zalamtech/DefinitelyTyped,opichals/DefinitelyTyped,UzEE/DefinitelyTyped,nakakura/DefinitelyTyped,rschmukler/DefinitelyTyped,glenndierckx/DefinitelyTyped,wilfrem/DefinitelyTyped,flyfishMT/DefinitelyTyped,timramone/DefinitelyTyped,sclausen/DefinitelyTyped,arusakov/DefinitelyTyped,Zzzen/DefinitelyTyped,mvarblow/DefinitelyTyped,dsebastien/DefinitelyTyped,Pro/DefinitelyTyped,nobuoka/DefinitelyTyped,BrandonCKrueger/DefinitelyTyped,arusakov/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,pkhayundi/DefinitelyTyped,olemp/DefinitelyTyped,Ridermansb/DefinitelyTyped,donnut/DefinitelyTyped,alextkachman/DefinitelyTyped,jsaelhof/DefinitelyTyped,Zorgatone/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,aciccarello/DefinitelyTyped,sergey-buturlakin/DefinitelyTyped,mhegazy/DefinitelyTyped,biomassives/DefinitelyTyped,wkrueger/DefinitelyTyped,stacktracejs/DefinitelyTyped,shlomiassaf/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,behzad888/DefinitelyTyped,georgemarshall/DefinitelyTyped,florentpoujol/DefinitelyTyped,chrootsu/DefinitelyTyped,gandjustas/DefinitelyTyped,arma-gast/DefinitelyTyped,hiraash/DefinitelyTyped,vagarenko/DefinitelyTyped,tan9/DefinitelyTyped,ErykB2000/DefinitelyTyped,elisee/DefinitelyTyped,jbrantly/DefinitelyTyped,zuohaocheng/DefinitelyTyped,trystanclarke/DefinitelyTyped,dsebastien/DefinitelyTyped,use-strict/DefinitelyTyped,raijinsetsu/DefinitelyTyped,magny/DefinitelyTyped,johan-gorter/DefinitelyTyped,stanislavHamara/DefinitelyTyped,markogresak/DefinitelyTyped,forumone/DefinitelyTyped,EnableSoftware/DefinitelyTyped,drillbits/DefinitelyTyped,optical/DefinitelyTyped,applesaucers/lodash-invokeMap,jimthedev/DefinitelyTyped,felipe3dfx/DefinitelyTyped,yuit/DefinitelyTyped,mshmelev/DefinitelyTyped,sixinli/DefinitelyTyped,bridge-ufsc/DefinitelyTyped,jeremyhayes/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,schmuli/DefinitelyTyped,damianog/DefinitelyTyped,QuatroCode/DefinitelyTyped,syuilo/DefinitelyTyped,subash-a/DefinitelyTyped,HPFOD/DefinitelyTyped,YousefED/DefinitelyTyped,nabeix/DefinitelyTyped,MugeSo/DefinitelyTyped,mattblang/DefinitelyTyped,rolandzwaga/DefinitelyTyped,donnut/DefinitelyTyped,rockclimber90/DefinitelyTyped,pocesar/DefinitelyTyped,lbesson/DefinitelyTyped,laco0416/DefinitelyTyped,drinchev/DefinitelyTyped,hafenr/DefinitelyTyped,paxibay/DefinitelyTyped,progre/DefinitelyTyped,eugenpodaru/DefinitelyTyped,fishgoh0nk/DefinitelyTyped,Saneyan/DefinitelyTyped,amanmahajan7/DefinitelyTyped,Dashlane/DefinitelyTyped,vagarenko/DefinitelyTyped,bennett000/DefinitelyTyped,mjjames/DefinitelyTyped,greglo/DefinitelyTyped,psnider/DefinitelyTyped,PopSugar/DefinitelyTyped,gandjustas/DefinitelyTyped,nelsonmorais/DefinitelyTyped,arusakov/DefinitelyTyped,KonaTeam/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,evandrewry/DefinitelyTyped,minodisk/DefinitelyTyped,nainslie/DefinitelyTyped,sledorze/DefinitelyTyped,UzEE/DefinitelyTyped,Shiak1/DefinitelyTyped,mendix/DefinitelyTyped,mhegazy/DefinitelyTyped,hellopao/DefinitelyTyped,mjjames/DefinitelyTyped,richardTowers/DefinitelyTyped,smrq/DefinitelyTyped,dydek/DefinitelyTyped,jimthedev/DefinitelyTyped,HPFOD/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,sergey-buturlakin/DefinitelyTyped,Dominator008/DefinitelyTyped,stylelab-io/DefinitelyTyped,emanuelhp/DefinitelyTyped,daptiv/DefinitelyTyped,innerverse/DefinitelyTyped,TheBay0r/DefinitelyTyped,florentpoujol/DefinitelyTyped,basp/DefinitelyTyped,mcrawshaw/DefinitelyTyped,nakakura/DefinitelyTyped,johan-gorter/DefinitelyTyped,kuon/DefinitelyTyped,dumbmatter/DefinitelyTyped,dpsthree/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,RedSeal-co/DefinitelyTyped,behzad888/DefinitelyTyped,arcticwaters/DefinitelyTyped,Penryn/DefinitelyTyped,brainded/DefinitelyTyped,syntax42/DefinitelyTyped,dflor003/DefinitelyTyped,nycdotnet/DefinitelyTyped,progre/DefinitelyTyped,Penryn/DefinitelyTyped,optical/DefinitelyTyped,angelobelchior8/DefinitelyTyped,applesaucers/lodash-invokeMap,aindlq/DefinitelyTyped,sclausen/DefinitelyTyped,bilou84/DefinitelyTyped,pwelter34/DefinitelyTyped,stephenjelfs/DefinitelyTyped,syuilo/DefinitelyTyped,hatz48/DefinitelyTyped,Mek7/DefinitelyTyped,ashwinr/DefinitelyTyped,psnider/DefinitelyTyped,jimthedev/DefinitelyTyped,vincentw56/DefinitelyTyped,nitintu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earhead-ea/DefinitelyTyped,NCARalph/DefinitelyTyped,esperco/DefinitelyTyped,chrismbarr/DefinitelyTyped,takenet/DefinitelyTyped,jaysoo/DefinitelyTyped,timjk/DefinitelyTyped,gcastre/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,stacktracejs/DefinitelyTyped,georgemarshall/DefinitelyTyped,alextkachman/DefinitelyTyped,GregOnNet/DefinitelyTyped,mwain/DefinitelyTyped,tdmckinn/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,fredgalvao/DefinitelyTyped,Trapulo/DefinitelyTyped,Bunkerbewohner/DefinitelyTyped,ashwinr/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,ciriarte/DefinitelyTyped,rcchen/DefinitelyTyped,lightswitch05/DefinitelyTyped,shlomiassaf/DefinitelyTyped,stephenjelfs/DefinitelyTyped,Karabur/DefinitelyTyped,GlennQuirynen/DefinitelyTyped,AgentME/DefinitelyTyped,chadoliver/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,borisyankov/DefinitelyTyped