Added missing IconType
Added missing IconType

https://github.com/recharts/recharts/pull/985
arusakov/DefinitelyTyped,magny/DefinitelyTyped,magny/DefinitelyTyped,rolandzwaga/DefinitelyTyped,one-pieces/DefinitelyTyped,dsebastien/DefinitelyTyped,AgentME/DefinitelyTyped,markogresak/DefinitelyTyped,zuzusik/DefinitelyTyped,borisyankov/DefinitelyTyped,alexdresko/DefinitelyTyped,rolandzwaga/DefinitelyTyped,arusakov/DefinitelyTyped,georgemarshall/DefinitelyTyped,zuzusik/DefinitelyTyped,georgemarshall/DefinitelyTyped,zuzusik/DefinitelyTyped,AgentME/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,mcliment/DefinitelyTyped,AgentME/DefinitelyTyped,chrootsu/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,alexdresko/DefinitelyTyped,arusakov/DefinitelyTyped,chrootsu/DefinitelyTyped,borisyankov/DefinitelyTyped,dsebastien/DefinitelyTyped,AgentME/DefinitelyTyped