update changelog

Signed-off-by: Brian L. Troutwine <brian.troutwine@datadoghq.com>

Author: blt

CHANGELOG.md

@@ -5,8 +5,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [0.14.0-rc2]
 ## Added
 - Added a CLI flag to disable the target module
+- Added the ability to configure details about DogStatsD payload
 
 ## [0.13.1]
 ## Added