Update package.json

update laravel mix to new version

package.json

@@ -10,7 +10,7 @@
     "axios": "^0.15.3",
     "bootstrap-sass": "^3.3.7",
     "jquery": "^3.1.1",
-    "laravel-mix": "^0.7.2",
+    "laravel-mix": "^0.8.1",
     "lodash": "^4.17.4",
     "vue": "^2.1.10"
   }