typings: Make Task#run's data field be optional

typings/index.d.ts

@@ -517,7 +517,7 @@ declare module 'klasa' {
 
 	export abstract class Task extends Piece {
 		public constructor(client: KlasaClient, store: TaskStore, file: string[], directory: string, options?: TaskOptions);
-		public abstract run(data: any): Promise<void>;
+		public abstract run(data?: any): Promise<void>;
 		public toJSON(): PieceTaskJSON;
 	}