Bump Mix dependency

package.json

@@ -10,7 +10,7 @@
     "axios": "^0.15.2",
     "bootstrap-sass": "^3.3.7",
     "jquery": "^3.1.0",
-    "laravel-mix": "^0.4.0",
+    "laravel-mix": "^0.5.0",
     "lodash": "^4.16.2",
     "vue": "^2.0.1"
   }