doc: update document.

Author: jaywcjlove

core/README.md

@@ -3,7 +3,7 @@ react-json-view
 
 [![CI](https://github.com/uiwjs/react-json-view/actions/workflows/ci.yml/badge.svg)](https://github.com/uiwjs/react-json-view/actions/workflows/ci.yml)
 [![npm version](https://img.shields.io/npm/v/@uiw/react-json-view.svg)](https://www.npmjs.com/package/@uiw/react-json-view)
-[![NPM Downloads](https://img.shields.io/npm/dm/@uiw/react-json-view.svg?style=flat&label=)](https://www.npmjs.com/package/@uiw/react-json-view) |
+[![NPM Downloads](https://img.shields.io/npm/dm/@uiw/react-json-view.svg?style=flat&label=)](https://www.npmjs.com/package/@uiw/react-json-view)
 [![react@^18](https://shields.io/badge/react-^18-green?style=flat&logo=react)](https://github.com/facebook/react/releases)
 [![Coverage Status](https://uiwjs.github.io/react-json-view/badges.svg)](https://uiwjs.github.io/react-json-view/lcov-report/)