update README to include badges

README.md

@@ -1,3 +1,10 @@
+[![Sourcegraph](https://sourcegraph.com/github.com/ugorji/go/-/badge.svg)](https://sourcegraph.com/github.com/ugorji/go/-/blob/codec)
+[![Build Status](https://travis-ci.org/ugorji/go.svg?branch=master)](https://travis-ci.org/ugorji/go)
+[![codecov](https://codecov.io/gh/ugorji/go/branch/master/graph/badge.svg)](https://codecov.io/gh/ugorji/go)
+[![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/ugorji/go/codec)
+[![rcard](https://goreportcard.com/badge/github.com/ugorji/go/codec)](https://goreportcard.com/report/github.com/ugorji/go/codec)
+[![License](http://img.shields.io/badge/license-mit-blue.svg?style=flat-square)](https://raw.githubusercontent.com/ugorji/go/master/LICENSE)
+
 # go/codec
 
 This repository contains the `go-codec` library,