refactor(config): update vue-cli4-config

Author: echo630

package.json

@@ -9,7 +9,6 @@
     "commit": "git-cz",
     "commit:retry": "git-cz --retry",
     "commit:noverify": "git-cz --no-verify",
-    "precommit": "npm run build && lint-staged",
     "release": "standard-version",
     "push": "git push --follow-tags origin master"
   },

vue.config.js

@@ -65,10 +65,6 @@ module.exports = {
   configureWebpack: config => {
     const plugins = [];
 
-    if (IS_PROD) {
-
-    }
-
     if (has_sprite) {
       // 生成雪碧图
       plugins.push(