adding containerClassName to YouTube component

types/react-youtube/index.d.ts

@@ -1,6 +1,7 @@
-// Type definitions for react-youtube 7.4
+// Type definitions for react-youtube 7.6
 // Project: https://github.com/troybetz/react-youtube
 // Definitions by: kgtkr <https://github.com/kgtkr>
+//                 Leo Salgueiro <https://github.com/salguerooo>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -39,6 +40,7 @@ export default class YouTube extends React.Component<{
     videoId?: string,
     id?: string,
     className?: string,
+    containerClassName?: string,
     opts?: Options,
     onReady?(event: { target: any }): void,
     onError?(event: { target: any, data: number }): void,