fix[Chore]: add @vue/cli-plugin-eslint

Author: PanJiaChen

package.json

@@ -75,6 +75,7 @@
     "@babel/core": "7.0.0",
     "@babel/register": "7.0.0",
     "@vue/cli-plugin-babel": "3.5.3",
+    "@vue/cli-plugin-eslint": "3.5.1",
     "@vue/cli-plugin-unit-jest": "3.5.3",
     "@vue/cli-service": "3.5.3",
     "@vue/test-utils": "1.0.0-beta.29",

vue.config.js

@@ -21,7 +21,7 @@ module.exports = {
   publicPath: '/',
   outputDir: 'dist',
   assetsDir: 'static',
-  lintOnSave: process.env.NODE_ENV === 'development' ? 'error' : false,
+  lintOnSave: process.env.NODE_ENV === 'development',
   productionSourceMap: false,
   devServer: {
     port: port,