add codecov test

README_ZH.md

@@ -4,12 +4,11 @@
 
 <p align="center">A goroutine pool for Go</p>
 
-
-
 [![Build Status][1]][2]
-[![godoc for panjf2000/ants][3]][4]
+[![codecov][3]][4]
 [![goreportcard for panjf2000/ants][5]][6]
-[![MIT Licence][7]][8]
+[![godoc for panjf2000/ants][7]][8]
+[![MIT Licence][9]][10]
 
 [英文说明页](README.md) | [项目介绍文章传送门](http://blog.taohuawu.club/article/42)
 
@@ -183,9 +182,11 @@ Go1.9
 
 [1]: https://travis-ci.com/panjf2000/ants.svg?branch=develop
 [2]: https://travis-ci.com/panjf2000/ants
-[3]: https://godoc.org/github.com/panjf2000/ants?status.svg
+[3]: https://codecov.io/gh/panjf2000/ants/branch/develop/graph/badge.svg
-[4]: https://godoc.org/github.com/panjf2000/ants
+[4]: https://codecov.io/gh/panjf2000/ants
 [5]: https://goreportcard.com/badge/github.com/panjf2000/ants
 [6]: https://goreportcard.com/report/github.com/panjf2000/ants
-[7]: https://badges.frapsoft.com/os/mit/mit.svg?v=103
+[7]: https://godoc.org/github.com/panjf2000/ants?status.svg
-[8]: https://opensource.org/licenses/mit-license.php
+[8]: https://godoc.org/github.com/panjf2000/ants
+[9]: https://badges.frapsoft.com/os/mit/mit.svg?v=103
+[10]: https://opensource.org/licenses/mit-license.php