add dll参数配置

@@ -6,6 +6,7 @@
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
     "lint": "vue-cli-service lint",
+    "dll": "vue-cli-service dll",
     "rm": "rm -rf dist/"
   },
   "dependencies": {
@@ -31,6 +32,7 @@
     "eslint-plugin-vue": "^5.0.0",
     "less": "^3.9.0",
     "less-loader": "^4.1.0",
+    "vue-cli-plugin-dll": "^1.1.3",
     "vue-template-compiler": "^2.5.21"
   }
 }