doc: Update README.md

Author: jaywcjlove

core/README.md

@@ -46,7 +46,6 @@ HeatMap 日历热图
 [![Build & Deploy](https://github.com/uiwjs/react-heat-map/actions/workflows/ci.yml/badge.svg)](https://github.com/uiwjs/react-heat-map/actions/workflows/ci.yml)
 [![Coverage Status](https://img.shields.io/npm/dm/@uiw/react-heat-map.svg?style=flat)](https://www.npmjs.com/package/@uiw/react-heat-map)
 [![npm version](https://img.shields.io/npm/v/@uiw/react-heat-map.svg)](https://www.npmjs.com/package/@uiw/react-heat-map)
-[![npm bundle size](https://img.shields.io/bundlephobia/minzip/@uiw/react-heat-map)](https://bundlephobia.com/result?p=@uiw/react-heat-map)
 [![Open in Gitpod](https://shields.io/badge/Open%20in-Gitpod-green?logo=Gitpod)](https://gitpod.io/#https://github.com/uiwjs/react-codemirror)
 <!--rehype:style=text-align: center;-->