jfoster Updated CHANGELOG.md with the new release version.

(cherry picked from commit a8ec6fc7)

Co-authored-by: Joe Foster <joefoster@seed-innovations.com>

CHANGELOG.md

@@ -3,6 +3,10 @@
 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).
 
 ---
+## [2.40.0]
+	
+- [!2.40.0](https://repo1.dso.mil/big-bang/bigbang/-/merge_requests?scope=all&utf8=%E2%9C%93&state=merged&milestone_title=2.40.0); List of merge requests in this release.
+
 ## [2.39.1]
 	
 - [!2.39.1](https://repo1.dso.mil/big-bang/bigbang/-/merge_requests?scope=all&utf8=%E2%9C%93&state=merged&milestone_title=2.39.0); List of merge requests in this release.