doc: updated change log date for 0.2.0

Author: ccuilla

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [0.2.0] - 2018-01-17
+## [0.2.0] - 2018-01-16
 ### Changed
 - Implemented more strict numeric type checking
 - Some type exception messages changed slightly