Update gulp image minification task

gulpfile.js

@@ -15,7 +15,7 @@ var uglify       = require('gulp-uglifyjs');
 var jshint          = require('gulp-jshint');
 var rename          = require('gulp-rename');
 var imagemin        = require('gulp-imagemin');
-var pngquant     = require('imagemin-pngquant');
+var imageminMozjpeg = require('imagemin-mozjpeg');
 
 /**
 *
@@ -74,9 +74,11 @@ gulp.task('jslint', function() {
 gulp.task('images', function () {
   return gulp.src('images/*')
     .pipe(imagemin({
+      optimizationLevel: 7,
       progressive: true,
-      svgoPlugins: [{removeViewBox: false}],
-      use: [pngquant()]
+      interlaced: true,
+      svgoPlugins: [{removeViewBox: true}],
+      use: [imageminMozjpeg()]
     }))
     .pipe(gulp.dest('images'));
 });

package.json

@@ -25,7 +25,9 @@
     "gulp-sass": "^2.2.0",
     "gulp-uglify": "^1.5.3",
     "gulp-uglifyjs": "^0.6.2",
-    "imagemin-pngquant": "^4.2.2",
     "jshint": "^2.9.1"
+  },
+  "dependencies": {
+    "imagemin-mozjpeg": "^5.1.0"
   }
 }