chore: tweak package

Author: yyx990803

packages/@vue/cli-ui-addon-webpack/package.json

@@ -1,7 +1,9 @@
 {
   "name": "@vue/cli-ui-addon-webpack",
   "version": "3.0.0-beta.11",
-  "private": true,
+  "files": [
+    "dist"
+  ],
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
@@ -23,5 +25,8 @@
     "> 1%",
     "last 2 versions",
     "not ie <= 8"
-  ]
+  ],
+  "publishConfig": {
+    "access": "public"
+  }
 }