message: readme: add badges
diff: -# AppRun [![Build Status](https://travis-ci.org/yysun/apprun.svg?branch=master)](https://travis-ci.org/yysun/apprun) [![npm](https://img.shields.io/npm/v/apprun.svg)](https://www.npmjs.org/package/apprun)
  +# AppRun [![Build][travis-image]][travis-url] [![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][downloads-url] [![License][license-image]][license-url] [![twitter][twitter-badge]][twitter]
  AppRun is a 3K library for building applications using the [Elm architecture](https://guide.elm-lang.org/architecture), [event pub-sub](https://yysun.github.io/apprun/docs/#/?id=event-pubsubs) and [components](https://yysun.github.io/apprun/docs/#/?id=component).
  @@ -149,3 +149,16 @@ Have fun and send pull requests.
  MIT
  Copyright (c) 2015-2018 Yiyi Sun
  +
  +
  +[travis-image]: https://travis-ci.org/yysun/apprun.svg?branch=master
  +[travis-url]: https://travis-ci.org/yysun/apprun
  +[npm-image]: https://img.shields.io/npm/v/apprun.svg
  +[npm-url]: https://npmjs.org/package/apprun
  +[license-image]: https://img.shields.io/:license-mit-blue.svg
  +[license-url]: LICENSE.md
  +[downloads-image]: http://img.shields.io/npm/dm/apprun.svg
  +[downloads-url]: https://npmjs.org/package/apprun
  +
  +[twitter]: https://twitter.com/intent/tweet?text=Check%20out%20AppRun%20by%20%40yysun%20https%3A%2F%2Fgithub.com%2Fyysun%2Fapprun%20%F0%9F%91%8D%20%40apprunjs
  +[twitter-badge]: https://img.shields.io/twitter/url/https/github.com/yysun/apprun.svg?style=social
  