[release] 4.2.1

package.json

 {
   "name": "vue-admin-template",
-  "version": "4.1.0",
+  "version": "4.2.1",
   "description": "A vue admin template with Element UI & axios & iconfont & permission control & lint",
   "author": "Pan <panfree23@gmail.com>",
   "license": "MIT",