Update CHANGELOG.md

Co-authored-by: Jonathan Manning <[email protected]>

Author: maxulysse

CHANGELOG.md

@@ -3,7 +3,7 @@
 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).
 
-## dev
+## v3.16.0dev - [date]
 
 ### Enhancements & fixes