Add std badges to README.md

README.md

@@ -1,2 +1,13 @@
 # goldiff
-Golden file testing for Go, with diff style output
+[![GoDoc](https://godoc.org/github.com/jhillyerd/goldiff?status.png)][GoDoc]
+[![Build Status](https://travis-ci.org/jhillyerd/goldiff.png?branch=master)][Build Status]
+[![Go Report Card](https://goreportcard.com/badge/github.com/jhillyerd/goldiff)][Go Report Card]
+[![Coverage Status](https://coveralls.io/repos/github/jhillyerd/goldiff/badge.svg)][Coverage Status]
+
+Golden file testing for [Go], with diff style output
+
+[Build Status]:    https://travis-ci.org/jhillyerd/goldiff
+[Coverage Status]: https://coveralls.io/github/jhillyerd/goldiff
+[GoDoc]:           https://godoc.org/github.com/jhillyerd/goldiff
+[Go]:              http://golang.org/
+[Go Report Card]:  https://goreportcard.com/report/github.com/jhillyerd/goldiff