Update README.md

Author: dsxack

README.md

@@ -6,6 +6,7 @@ Go packages that don't really deserve their own repos.
 [![GoDoc](https://godoc.org/github.com/DsXack/go?status.svg)](https://godoc.org/github.com/DsXack/go)
 [![Travis](https://travis-ci.org/DsXack/go.svg?branch=master)](https://travis-ci.org/DsXack/go)
 [![Go Report Card](https://goreportcard.com/badge/github.com/dsxack/go)](https://goreportcard.com/report/github.com/dsxack/go)
+[![codecov](https://codecov.io/gh/DsXack/go/branch/master/graph/badge.svg)](https://codecov.io/gh/DsXack/go)
 ---
 
 > GitHub [@dsxack](https://github.com/dsxack)  ·