Add usage badge to READMe.md

Author: danielfireman

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/frictionlessdata/datapackage-go.svg?branch=master)](https://travis-ci.org/frictionlessdata/datapackage-go) [![Coverage Status](https://coveralls.io/repos/github/frictionlessdata/datapackage-go/badge.svg?branch=master)](https://coveralls.io/github/frictionlessdata/datapackage-go?branch=master) [![Go Report Card](https://goreportcard.com/badge/github.com/frictionlessdata/datapackage-go)](https://goreportcard.com/report/github.com/frictionlessdata/datapackage-go) [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/frictionlessdata/chat) [![GoDoc](https://godoc.org/github.com/frictionlessdata/datapackage-go?status.svg)](https://godoc.org/github.com/frictionlessdata/datapackage-go)
+[![Build Status](https://travis-ci.org/frictionlessdata/datapackage-go.svg?branch=master)](https://travis-ci.org/frictionlessdata/datapackage-go) [![Coverage Status](https://coveralls.io/repos/github/frictionlessdata/datapackage-go/badge.svg?branch=master)](https://coveralls.io/github/frictionlessdata/datapackage-go?branch=master) [![Go Report Card](https://goreportcard.com/badge/github.com/frictionlessdata/datapackage-go)](https://goreportcard.com/report/github.com/frictionlessdata/datapackage-go) [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/frictionlessdata/chat) [![GoDoc](https://godoc.org/github.com/frictionlessdata/datapackage-go?status.svg)](https://godoc.org/github.com/frictionlessdata/datapackage-go) [![Sourcegraph](https://sourcegraph.com/github.com/frictionlessdata/datapackage-go/-/badge.svg)](https://sourcegraph.com/github.com/frictionlessdata/datapackage-go?badge)
 
 # datapackage-go
 A Go library for working with [Data Packages](http://specs.frictionlessdata.io/data-package/).
@@ -240,4 +240,4 @@ pkg.AddResource(map[string]interface{}{
 cities, _ := pkg.GetResource("cities").ReadAll()
 fmt.Println(cities)
 // [[london 2017 8780000] [paris 2017 2240000] [rome 20172860000]]
-```
+```