Update CHANGELOG

Author: Stephen Powis

CHANGELOG.md

@@ -3,6 +3,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## 1.0.4 (UNRELEASED)
+
+### Internal Dependency Updates
 - Updated Guava from 24.0-JRE to 25.0-JRE for [CVE-2018-10237](https://github.com/google/guava/wiki/CVE-2018-10237).
 - Replace internal calls to Guava's Preconditions with Objects.requireNonNull()