node更新至v8.11.1

README.md

## 说明文档
项目目录、开发、部署等说明都在[wiki](https://github.com/daxiongYang/renren-fast-vue/wiki)中。
项目开发、部署等说明都在[wiki](https://github.com/daxiongYang/renren-fast-vue/wiki)中。
## 更新日志

package.json

    "jest-serializer-vue": "0.3.0",
    "nightwatch": "0.9.12",
    "node-notifier": "5.1.2",
    "node-sass": "4.7.2",
    "node-sass": "4.9.0",
    "optimize-css-assets-webpack-plugin": "3.2.0",
    "ora": "1.2.0",
    "portfinder": "1.0.13",
    "webpack-merge": "4.1.0"
  },
  "engines": {
    "node": ">= 4.0.0",
    "npm": ">= 3.0.0"
    "node": ">= 8.11.1",
    "npm": ">= 5.6.0"
  },
  "browserslist": [
    "> 1%",