Added go report card

README.md

@@ -1,2 +1,5 @@
 # rest
+
+[![Go Report Card](https://goreportcard.com/report/github.com/pczajkowski/rest)](https://goreportcard.com/report/github.com/pczajkowski/rest)
+
 Bunch of methods which help me in my daily battle with REST APIs.