Fix CHANGELOG link

Author: gpahal

CHANGELOG.md

@@ -58,7 +58,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Full compatibility with Dgraph v1.0.0
 
 [Unreleased]: https://github.com/dgraph-io/dgraph-js/compare/v1.1.1...HEAD
-[v1.1.0]: https://github.com/dgraph-io/dgraph-js/compare/v1.1.0...v1.1.1
+[v1.1.1]: https://github.com/dgraph-io/dgraph-js/compare/v1.1.0...v1.1.1
 [v1.1.0]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.4...v1.1.0
 [v1.0.4]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.3...v1.0.4
 [v1.0.3]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.2...v1.0.3