Change log is updated for v2.1.1

Author: sbellware

CHANGES.md

@@ -1,5 +1,13 @@
 # Changes
 
+## 2.1.1
+
+Thu Apr 30 2020
+
+Message DB compatibility: [1.2.1](https://github.com/message-db/message-db/releases/tag/v1.2.1)
+
+- The `DROP OWNED BY message_store` statement is removed from the uninstall script. The use of `DROP OWNED BY` is prohibited on AWS RDS. And ultimately, it's superfluous because no database objects are owned by the message_store role.
+
 ## 2.1.0
 
 Mon Apr 27 2020