Updated the changelog (0.5.2)

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/).
 
+## [0.5.2](https://github.com/shyiko/mysql-binlog-connector-java/compare/0.5.1...0.5.2) - 2016-11-19
+
+### Fixed
+ - (JSON) deserialization of null/true/false/(u)int(16|32)/variable-length data types ([#129](https://github.com/shyiko/mysql-binlog-connector-java/issues/129)).
+
 ## [0.5.1](https://github.com/shyiko/mysql-binlog-connector-java/compare/0.5.0...0.5.1) - 2016-10-18
 
 ### Fixed