Change log is updated for v2.0.1

Author: sbellware

CHANGES.md

@@ -1,5 +1,14 @@
 # Changes
 
+## 2.0.1
+
+Fri Dec 20 2019
+
+Message DB compatibility: [1.1.5](https://github.com/message-db/message-db/releases/tag/v1.1.5)
+
+- Changes applied to a pre-v1 message store are documented in database/update/1.0.0.md
+- The v1 update script prints out a link to the changes doc
+
 ## 2.0.0
 
 Fri Dec 20 2019