Add Go Report Card badge

Author: farazfazli

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://travis-ci.org/GetGoBlog/GoBlog.svg?branch=master)](https://travis-ci.org/GetGoBlog/GoBlog)
 [![Twitter](https://img.shields.io/twitter/url/https/github.com/getgoblog/goblog.svg?style=social?style=flat-square)](https://twitter.com/intent/tweet?text=Check out www.github.com/GetGoBlog/GoBlog an open-source blogging platform written in Go. Try it out free for life at http://goblog.pw)
 [![GoBlog](https://img.shields.io/badge/goblog.pw-online-brightgreen.svg)](http://www.goblog.pw)
+[![Go Report Card](https://goreportcard.com/badge/github.com/GetGoBlog/GoBlog)](https://goreportcard.com/report/github.com/GetGoBlog/GoBlog)
 
 Let's Encrypt support coming soon -- stay tuned!