Update readme.md

add goproxy.cn download badge

readme.md

@@ -12,6 +12,7 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 -->
 [![Go](https://github.com/tal-tech/go-zero/workflows/Go/badge.svg?branch=master)](https://github.com/tal-tech/go-zero/actions)
+[![goproxy](https://goproxy.cn/stats/github.com/tal-tech/go-zero/badges/download-count.svg)](https://goproxy.cn/stats/github.com/tal-tech/go-zero/badges/download-count.svg)
 [![codecov](https://codecov.io/gh/tal-tech/go-zero/branch/master/graph/badge.svg)](https://codecov.io/gh/tal-tech/go-zero)
 [![Release](https://img.shields.io/github/v/release/tal-tech/go-zero.svg?style=flat-square)](https://github.com/tal-tech/go-zero)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)