update CHANGELOG

Author: Jordan Fineberg

CHANGELOG.md

@@ -4,6 +4,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the format listed [here](https://github.com/sensu-plugins/community/blob/master/HOW_WE_CHANGELOG.md).
 
 ## [Unreleased]
+### Fixed
+- version number check for build strings such as `10.3 (Ubuntu 10.3-1.pgdg16.04+1)`
 
 ### Added
 - tests for connecting with a pgpass file (@majormoses)