doc: Update README.md

Author: jaywcjlove

README.md

@@ -5,7 +5,7 @@ React Markdown Preview
 [![Build and Deploy](https://github.com/uiwjs/react-markdown-preview/actions/workflows/ci.marster.yml/badge.svg)](https://github.com/uiwjs/react-markdown-preview/actions/workflows/ci.marster.yml)
 [![jsDelivr CDN](https://data.jsdelivr.com/v1/package/npm/@uiw/react-markdown-preview/badge?style=rounded)](https://www.jsdelivr.com/package/npm/@uiw/react-markdown-preview)
 [![Downloads](https://img.shields.io/npm/dm/@uiw/react-markdown-preview.svg?style=flat)](https://www.npmjs.com/package/@uiw/react-markdown-preview)
-[![Coverage Status](https://coveralls.io/repos/github/uiwjs/react-markdown-preview/badge.svg?branch=master)](https://coveralls.io/github/uiwjs/react-markdown-preview?branch=master)
+[![Coverage Status](https://uiwjs.github.io/react-markdown-preview/badges.svg)](https://uiwjs.github.io/react-markdown-preview/coverage/lcov-report/)
 [![npm version](https://img.shields.io/npm/v/@uiw/react-markdown-preview.svg)](https://www.npmjs.com/package/@uiw/react-markdown-preview)
 [![npm unpkg](https://img.shields.io/badge/Open%20in-unpkg-blue)](https://uiwjs.github.io/npm-unpkg/#/pkg/@uiw/react-markdown-preview/file/README.md)