Update README.md

PeterIvanov · web-flow · commit 73d080b4dced · 2018-11-19T10:02:18.000+03:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-[![GoDoc](https://godoc.org/github.com/joomcode/errorx?status.svg)](https://godoc.org/github.com/joomcode/errorx) [![Report Card](https://goreportcard.com/badge/github.com/joomcode/errorx)](https://goreportcard.com/report/github.com/joomcode/errorx)
+[![GoDoc](https://godoc.org/github.com/joomcode/errorx?status.svg)](https://godoc.org/github.com/joomcode/errorx) [![Report Card](https://goreportcard.com/badge/github.com/joomcode/errorx)](https://goreportcard.com/report/github.com/joomcode/errorx) [![gocover.io](https://gocover.io/_badge/github.com/joomcode/errorx)](https://gocover.io/github.com/joomcode/errorx)
 
 ## Highlights
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-[![GoDoc](https://godoc.org/github.com/joomcode/errorx?status.svg)](https://godoc.org/github.com/joomcode/errorx) [![Report Card](https://goreportcard.com/badge/github.com/joomcode/errorx)](https://goreportcard.com/report/github.com/joomcode/errorx)`
	`1`	`+[![GoDoc](https://godoc.org/github.com/joomcode/errorx?status.svg)](https://godoc.org/github.com/joomcode/errorx) [![Report Card](https://goreportcard.com/badge/github.com/joomcode/errorx)](https://goreportcard.com/report/github.com/joomcode/errorx) [![gocover.io](https://gocover.io/_badge/github.com/joomcode/errorx)](https://gocover.io/github.com/joomcode/errorx)`
`2`	`2`
`3`	`3`	`## Highlights`
`4`	`4`