Update changelog for 2.11.2 (#751)

Author: twsouthwick

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## Version 2.11.2
+## Version 2.11.2 - 2020-07-10
 
 ### Fixed
 - Fixed broken source link (#749)