Integrate sourcegraph badge

README.md

@@ -2,6 +2,7 @@
 [![Build Status](https://circleci.com/gh/emirpasic/gods/tree/master.svg?style=shield)](https://circleci.com/gh/emirpasic/gods?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/emirpasic/gods)](https://goreportcard.com/report/github.com/emirpasic/gods)
 [![codecov](https://codecov.io/gh/emirpasic/gods/branch/master/graph/badge.svg)](https://codecov.io/gh/emirpasic/gods)
+[![Sourcegraph](https://sourcegraph.com/github.com/emirpasic/gods/-/badge.svg)](https://sourcegraph.com/github.com/emirpasic/gods?badge)
 [![PyPI](https://img.shields.io/badge/License-BSD_2--Clause-green.svg)](https://github.com/emirpasic/gods/blob/master/LICENSE)
 
 # GoDS (Go Data Structures)