update changelog

Author: jfromaniello

CHANGELOG.md

@@ -1,8 +1,13 @@
 # Change Log
 
+
 All notable changes to this project will be documented in this file starting from version **v4.0.0**.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 7.0.0 - 2016-05-19
+
+ - change jwt.sign to return errors on callback instead of throwing errors ([1e46c5a42aa3dab8478efa4081d8f8f5c5485d56](https://github.com/auth0/node-jsonwebtoken/commit/1e46c5a42aa3dab8478efa4081d8f8f5c5485d56))
+
 ## 6.2.0 - 2016-04-29
 
  - add support for `options.clockTolerance` to `jwt.verify` ([65ddea934f226bf06bc9d6a55be9587515cfc38d](https://github.com/auth0/node-jsonwebtoken/commit/65ddea934f226bf06bc9d6a55be9587515cfc38d))