[Doppins] Upgrade dependency node-sass to 4.5.3

package.json

@@ -27,6 +27,6 @@
     "gulp-sass": "2.3.1",
     "gulp-uglify": "1.5.3",
     "jshint": "2.9.2",
-    "node-sass": "2.1.1"
+    "node-sass": "4.5.3"
   }
 }