Update Changelog to Sous Chefs

Signed-off-by: Lance Albertson <lance@osuosl.org>

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 This file is used to list changes made in each version of the erlang cookbook.
 
+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
+
+### Changed
+
+- Sous Chefs Adoption
+- Update Changelog to Sous Chefs
+
 ## 8.0.0 (2019-10-07)
 
 - Resolve Cookstyle 5.8 warnings - [@tas50](https://github.com/tas50)