Update change log

Author: yriveiro

CHANGELOG.md

@@ -2,6 +2,12 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 2.0.0 - 2017-07-04
+### Changed
+- Major version 2.x only supports php >= 7.0
+- Fixed tests to run with php >=7.0
+
+
 ## 1.0.2 - 2017-05-21
 ### Changed
 - Fix issues reported by SessionLabs code analyzer.