Check JPEG compression with progressive flag by default

lib/tools/weightChecker/imageOptimizer.js

@@ -196,9 +196,9 @@ var ImageOptimizer = function() {
 
         var engine;
         if (type === 'jpeg' && !lossy) {
-            engine = imageminJpegtran({progressive: false});
+            engine = imageminJpegtran({progressive: true});
         } else if (type === 'jpeg' && lossy) {
-            engine = imageminJpegoptim({progressive: false, max: MAX_JPEG_QUALITY});
+            engine = imageminJpegoptim({progressive: true, max: MAX_JPEG_QUALITY});
         } else if (type === 'png' && !lossy) {
             engine = imageminOptipng({optimizationLevel: OPTIPNG_COMPRESSION_LEVEL});
         } else if (type === 'svg' && !lossy) {