add Go Report Card

README.md

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-# jrpc - rpc with json [![Build Status](https://travis-ci.org/go-pkgz/jrpc.svg?branch=master)](https://travis-ci.org/go-pkgz/jrpc) [![Coverage Status](https://coveralls.io/repos/github/go-pkgz/jrpc/badge.svg?branch=master)](https://coveralls.io/github/go-pkgz/jrpc?branch=master) [![godoc](https://godoc.org/github.com/go-pkgz/jrpc?status.svg)](https://godoc.org/github.com/go-pkgz/jrpc)
+# jrpc - rpc with json [![Build Status](https://travis-ci.org/go-pkgz/jrpc.svg?branch=master)](https://travis-ci.org/go-pkgz/jrpc) [![Go Report Card](https://goreportcard.com/badge/github.com/go-pkgz/jrpc)](https://goreportcard.com/report/github.com/go-pkgz/jrpc) [![Coverage Status](https://coveralls.io/repos/github/go-pkgz/jrpc/badge.svg?branch=master)](https://coveralls.io/github/go-pkgz/jrpc?branch=master) [![godoc](https://godoc.org/github.com/go-pkgz/jrpc?status.svg)](https://godoc.org/github.com/go-pkgz/jrpc)
 
 jrpc library provides client and server for RPC-like communication over HTTP with json encoded messages.
 The protocol is a somewhat simplified version of json-rpc with a single POST call sending Request json