add fullWidth to FlatButtonProps
add fullWidth to FlatButtonProps

GiedriusGrabauskas/DefinitelyTyped,isman-usoh/DefinitelyTyped,AgentME/DefinitelyTyped,georgemarshall/DefinitelyTyped,nycdotnet/DefinitelyTyped,rolandzwaga/DefinitelyTyped,YousefED/DefinitelyTyped,QuatroCode/DefinitelyTyped,AgentME/DefinitelyTyped,dsebastien/DefinitelyTyped,isman-usoh/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,aciccarello/DefinitelyTyped,zuzusik/DefinitelyTyped,magny/DefinitelyTyped,aciccarello/DefinitelyTyped,smrq/DefinitelyTyped,AgentME/DefinitelyTyped,markogresak/DefinitelyTyped,arusakov/DefinitelyTyped,abbasmhd/DefinitelyTyped,chrootsu/DefinitelyTyped,georgemarshall/DefinitelyTyped,smrq/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,arusakov/DefinitelyTyped,benliddicott/DefinitelyTyped,ashwinr/DefinitelyTyped,arusakov/DefinitelyTyped,alexdresko/DefinitelyTyped,jimthedev/DefinitelyTyped,johan-gorter/DefinitelyTyped,AgentME/DefinitelyTyped,zuzusik/DefinitelyTyped,borisyankov/DefinitelyTyped,benishouga/DefinitelyTyped,jimthedev/DefinitelyTyped,johan-gorter/DefinitelyTyped,zuzusik/DefinitelyTyped,georgemarshall/DefinitelyTyped,aciccarello/DefinitelyTyped,nycdotnet/DefinitelyTyped,jimthedev/DefinitelyTyped,benishouga/DefinitelyTyped,rolandzwaga/DefinitelyTyped,chrootsu/DefinitelyTyped,ashwinr/DefinitelyTyped,benishouga/DefinitelyTyped,amir-arad/DefinitelyTyped,dsebastien/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,YousefED/DefinitelyTyped,abbasmhd/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,magny/DefinitelyTyped,minodisk/DefinitelyTyped,borisyankov/DefinitelyTyped,mcrawshaw/DefinitelyTyped,georgemarshall/DefinitelyTyped,QuatroCode/DefinitelyTyped,mcliment/DefinitelyTyped,alexdresko/DefinitelyTyped,mcrawshaw/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,one-pieces/DefinitelyTyped,minodisk/DefinitelyTyped