Added callback type for sts.assumerole
Added callback type for sts.assumerole

mcrawshaw/DefinitelyTyped,zuzusik/DefinitelyTyped,magny/DefinitelyTyped,one-pieces/DefinitelyTyped,georgemarshall/DefinitelyTyped,arusakov/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,paulmorphy/DefinitelyTyped,schmuli/DefinitelyTyped,jimthedev/DefinitelyTyped,newclear/DefinitelyTyped,schmuli/DefinitelyTyped,benishouga/DefinitelyTyped,arma-gast/DefinitelyTyped,damianog/DefinitelyTyped,AgentME/DefinitelyTyped,ashwinr/DefinitelyTyped,AgentME/DefinitelyTyped,yuit/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,schmuli/DefinitelyTyped,abbasmhd/DefinitelyTyped,rolandzwaga/DefinitelyTyped,florentpoujol/DefinitelyTyped,danfma/DefinitelyTyped,magny/DefinitelyTyped,pocesar/DefinitelyTyped,abner/DefinitelyTyped,gcastre/DefinitelyTyped,psnider/DefinitelyTyped,syuilo/DefinitelyTyped,frogcjn/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,shlomiassaf/DefinitelyTyped,martinduparc/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,QuatroCode/DefinitelyTyped,smrq/DefinitelyTyped,alvarorahul/DefinitelyTyped,progre/DefinitelyTyped,johan-gorter/DefinitelyTyped,daptiv/DefinitelyTyped,borisyankov/DefinitelyTyped,nainslie/DefinitelyTyped,zuzusik/DefinitelyTyped,markogresak/DefinitelyTyped,scriby/DefinitelyTyped,sledorze/DefinitelyTyped,subash-a/DefinitelyTyped,arusakov/DefinitelyTyped,johan-gorter/DefinitelyTyped,arusakov/DefinitelyTyped,paulmorphy/DefinitelyTyped,mattblang/DefinitelyTyped,alvarorahul/DefinitelyTyped,benishouga/DefinitelyTyped,AgentME/DefinitelyTyped,rcchen/DefinitelyTyped,hellopao/DefinitelyTyped,nycdotnet/DefinitelyTyped,rolandzwaga/DefinitelyTyped,gandjustas/DefinitelyTyped,pocesar/DefinitelyTyped,mcliment/DefinitelyTyped,minodisk/DefinitelyTyped,nycdotnet/DefinitelyTyped,damianog/DefinitelyTyped,newclear/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,sledorze/DefinitelyTyped,use-strict/DefinitelyTyped,florentpoujol/DefinitelyTyped,borisyankov/DefinitelyTyped,yuit/DefinitelyTyped,ashwinr/DefinitelyTyped,psnider/DefinitelyTyped,aciccarello/DefinitelyTyped,Ptival/DefinitelyTyped,hellopao/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,HPFOD/DefinitelyTyped,amanmahajan7/DefinitelyTyped,aciccarello/DefinitelyTyped,frogcjn/DefinitelyTyped,syuilo/DefinitelyTyped,aciccarello/DefinitelyTyped,chrismbarr/DefinitelyTyped,benliddicott/DefinitelyTyped,georgemarshall/DefinitelyTyped,martinduparc/DefinitelyTyped,YousefED/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,donnut/DefinitelyTyped,dsebastien/DefinitelyTyped,zuzusik/DefinitelyTyped,Ptival/DefinitelyTyped,arma-gast/DefinitelyTyped,minodisk/DefinitelyTyped,amir-arad/DefinitelyTyped,alexdresko/DefinitelyTyped,nainslie/DefinitelyTyped,georgemarshall/DefinitelyTyped,QuatroCode/DefinitelyTyped,abbasmhd/DefinitelyTyped,chrootsu/DefinitelyTyped,progre/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,AgentME/DefinitelyTyped,jimthedev/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,alexdresko/DefinitelyTyped,benishouga/DefinitelyTyped,isman-usoh/DefinitelyTyped,Penryn/DefinitelyTyped,scriby/DefinitelyTyped,isman-usoh/DefinitelyTyped,Penryn/DefinitelyTyped,smrq/DefinitelyTyped,use-strict/DefinitelyTyped,chrismbarr/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,rcchen/DefinitelyTyped,georgemarshall/DefinitelyTyped,pocesar/DefinitelyTyped,musicist288/DefinitelyTyped,HPFOD/DefinitelyTyped,mcrawshaw/DefinitelyTyped,chrootsu/DefinitelyTyped,amanmahajan7/DefinitelyTyped,subash-a/DefinitelyTyped,YousefED/DefinitelyTyped,abner/DefinitelyTyped,mattblang/DefinitelyTyped,donnut/DefinitelyTyped,jraymakers/DefinitelyTyped,danfma/DefinitelyTyped,dsebastien/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,hellopao/DefinitelyTyped,martinduparc/DefinitelyTyped,jraymakers/DefinitelyTyped,shlomiassaf/DefinitelyTyped,micurs/DefinitelyTyped,gcastre/DefinitelyTyped,psnider/DefinitelyTyped,gandjustas/DefinitelyTyped,xStrom/DefinitelyTyped,xStrom/DefinitelyTyped,jimthedev/DefinitelyTyped