update README.md

README.md

@@ -3,7 +3,7 @@
 ![arthas](site/docs/.vuepress/public/images/arthas.png)
 
 [![Build Status](https://github.com/alibaba/arthas/workflows/JavaCI/badge.svg)](https://github.com/alibaba/arthas/actions)
-[![codecov](https://codecov.io/gh/alibaba/arthas/branch/master/graph/badge.svg)](https://codecov.io/gh/alibaba/arthas)
+[![download](https://img.shields.io/github/downloads/alibaba/arthas/total?label=Downloads)](https://github.com/alibaba/arthas/releases/latest)
 [![maven](https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg)](https://search.maven.org/search?q=g:com.taobao.arthas)
 ![license](https://img.shields.io/github/license/alibaba/arthas.svg)
 [![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/alibaba/arthas.svg)](http://isitmaintained.com/project/alibaba/arthas "Average time to resolve an issue")