Fix CHANGELOG link

Author: gpahal

CHANGELOG.md

@@ -41,7 +41,7 @@ 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/v1.0.4...HEAD
-[v1.0.3]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.3...v1.0.4
+[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
 [v1.0.2]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.1...v1.0.2
 [v1.0.1]: https://github.com/dgraph-io/dgraph-js/compare/v1.0.0...v1.0.1