Update README.md

README.md

@@ -2,6 +2,7 @@
 <img align="right" src="https://raw.githubusercontent.com/go-playground/locales/master/logo.png">
 ![Project status](https://img.shields.io/badge/version-0.10.1-green.svg)
 [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/locales/branches/master/badge.svg)](https://semaphoreci.com/joeybloggs/locales)
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/locales)](https://goreportcard.com/report/github.com/go-playground/locales)
 [![GoDoc](https://godoc.org/github.com/go-playground/locales?status.svg)](https://godoc.org/github.com/go-playground/locales)
 ![License](https://img.shields.io/dub/l/vibe-d.svg)
 [![Gitter](https://badges.gitter.im/go-playground/locales.svg)](https://gitter.im/go-playground/locales?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)