Updating changelog for v2.0.1

Author: prashant-shahi

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [v2.0.1] - 2019-09-10
+
+### Fixed
+- Added function to refresh JWT token if expired
+  ([#56](https://github.com/dgraph-io/dgraph-js/issues/56))
+
 ## [v2.0.0] - 2019-09-06
 
 ### Added
@@ -96,6 +102,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - Full compatibility with Dgraph v1.0.0
 
+[v2.0.1]: 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
 [v1.2.0]: https://github.com/dgraph-io/dgraph-js/compare/v1.1.2...v1.2.0