Added 0.5.0 release notes

Author: shyiko

changelog.md

@@ -2,6 +2,11 @@
 All notable changes to this project will be documented in this file.  
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [0.5.0](https://github.com/shyiko/mysql-binlog-connector-java/compare/0.4.2...0.5.0) - 2016-10-06
+
+### Added
+ - JSON support ([#119](https://github.com/shyiko/mysql-binlog-connector-java/pull/119)) (thanks to [@rhauch](https://github.com/rhauch)).
+
 ## [0.4.2](https://github.com/shyiko/mysql-binlog-connector-java/compare/0.4.1...0.4.2) - 2016-09-20
 
 ### Fixed