update README (#5)

* update README

* update README

Author: li-jia-nan

README.md

@@ -1,33 +1,28 @@
 # rc-mutate-observer
 
-React 18 supported Portal Component.
+MutateObserver for React.
 
 [![NPM version][npm-image]][npm-url] [![dumi](https://img.shields.io/badge/docs%20by-dumi-blue?style=flat-square)](https://github.com/umijs/dumi) [![build status][github-actions-image]][github-actions-url] [![Codecov][codecov-image]][codecov-url] [![npm download][download-image]][download-url]
 
-[npm-image]: http://img.shields.io/npm/v/rc-portal.svg?style=flat-square
-[npm-url]: http://npmjs.org/package/rc-portal
-[github-actions-image]: https://github.com/react-component/portal/workflows/CI/badge.svg
-[github-actions-url]: https://github.com/react-component/portal/actions
-[codecov-image]: https://img.shields.io/codecov/c/github/react-component/portal/master.svg?style=flat-square
-[codecov-url]: https://codecov.io/gh/react-component/portal/branch/master
-[download-image]: https://img.shields.io/npm/dm/rc-portal.svg?style=flat-square
-[download-url]: https://npmjs.org/package/rc-portal
+[npm-image]: http://img.shields.io/npm/v/@rc-component/mutate-observer.svg?style=flat-square
+[npm-url]: https://www.npmjs.com/package/@rc-component/mutate-observer
+[github-actions-image]: https://github.com/react-component/mutate-observer/workflows/CI/badge.svg
+[github-actions-url]: https://github.com/react-component/mutate-observer/actions
+[codecov-image]: https://img.shields.io/codecov/c/github/@rc-component/mutate-observer/master.svg?style=flat-square
+[download-image]: https://img.shields.io/npm/dm/@rc-component/mutate-observer.svg?style=flat-square
+[download-url]: https://www.npmjs.com/package/@rc-component/mutate-observer
 
 ## Development
 
 ```bash
 npm install
-npm start
+npm run start
 open http://localhost:8000
 ```
 
-## Feature
-
-- React life cycle support portal component
-
 ## Install
 
-[![rc-portal](https://nodei.co/npm/rc-portal.png)](https://npmjs.org/package/rc-portal)
+[![@rc-component/mutate-observer](https://nodei.co/npm/mutate-observer.png)](https://www.npmjs.com/package/@rc-component/mutate-observer)
 
 ## Usage
 
@@ -53,9 +48,9 @@ export default Demo;
 
 ## 🔥 API
 
-We use typescript to create the Type definition. You can view directly in IDE. But you can still check the type definition [here](https://github.com/react-component/portal/blob/master/src/interface.ts).
+We use typescript to create the Type definition. You can view directly in IDE. But you can still check the type definition [here](https://github.com/react-component/mutate-observer/blob/master/src/interface.ts).
 
-### Portal
+### mutate-observer
 
 | Prop     | Description                                                                                                      | Type                 | Default |
 | -------- | ---------------------------------------------------------------------------------------------------------------- | -------------------- | ------- |