message: doc: add discord chat badge
diff: -# 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]
  -
  -[![Discord Chat][discord-image]][discord-invite]
  +# 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] [![Discord Chat][discord-image]][discord-invite]
  AppRun is a 3K library for building reliable, high-performance web applications using the [Elm inspired Architecture](https://yysun.github.io/apprun/docs/#/?id=architecture), [event pub-sub](https://yysun.github.io/apprun/docs/#/?id=event-pubsubs) and [components](https://yysun.github.io/apprun/docs/#/?id=component).
  