Adding v2.0.2 compare link

Author: prashant-shahi

CHANGELOG.md

@@ -111,6 +111,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - Full compatibility with Dgraph v1.0.0
 
+[v2.0.2]: https://github.com/dgraph-io/dgraph-js/compare/v2.0.1...v2.0.2
 [v2.0.1]: https://github.com/dgraph-io/dgraph-js/compare/v2.0.0...v2.0.1
 [v2.0.0]: https://github.com/dgraph-io/dgraph-js/compare/v1.2.1...v2.0.0
 [v1.2.1]: https://github.com/dgraph-io/dgraph-js/compare/v1.2.0...v1.2.1