preventing URL grabber keeping to dump stats when finished

stress-http.js

@@ -274,10 +274,11 @@ new Promise( resolve => {
 			return list;
 		}
 
+		const grabber = new Client( "grabber" );
+
 		return new Promise( ( resolve, reject ) => {
 			const inQueue = [StartUrl];
 			const results = {};
-			const grabber = new Client( "grabber" );
 
 			grab( inQueue, results );
 
@@ -339,6 +340,8 @@ new Promise( resolve => {
 			}
 		} )
 			.then( list => {
+				clearInterval( grabber.statsTimer );
+
 				File.writeFileSync( cacheFile, list.join( process.platform === "win32" ? "\r\n" : "\n" ) );
 
 				return list;