bump versions

Author: ozzyrod

package.json

@@ -25,13 +25,13 @@
   "dependencies": {
     "autoprefixer": "9.x",
     "grunt": "~1.x",
-    "grunt-contrib-clean": "1.x",
-    "grunt-contrib-concat": "1.x",
+    "grunt-contrib-clean": "2.x",
     "grunt-contrib-compress": "1.x",
+    "grunt-contrib-concat": "1.x",
     "grunt-contrib-copy": "1.x",
-    "grunt-contrib-cssmin": "2.x",
-    "grunt-contrib-imagemin": "2.x",
-    "grunt-contrib-uglify": "3.x",
+    "grunt-contrib-cssmin": "3.x",
+    "grunt-contrib-imagemin": "3.x",
+    "grunt-contrib-uglify": "4.x",
     "grunt-contrib-watch": "1.x",
     "grunt-newer": "1.x",
     "grunt-postcss": "0.x",
@@ -40,8 +40,8 @@
     "grunt-sass": "3.x",
     "grunt-version": "1.x",
     "grunt-wp-i18n": "1.x",
-    "postcss-pxtorem": "4.x",
-    "time-grunt": "1.x",
-    "node-sass": "4.x"
+    "node-sass": "4.x",
+    "postcss-pxtorem": "5.x",
+    "time-grunt": "1.x"
   }
 }