CHANGELOG.md in glimmer-2.1.5 vs CHANGELOG.md in glimmer-2.2.0

- old
+ new
@@ -1,9 +1,15 @@
 # Change Log
 
 Related Change Logs:
 - [glimmer-dsl-swt/CHANGELOG.md](https://github.com/AndyObtiva/glimmer-dsl-swt/blob/master/CHANGELOG.md)
 
+### 2.2.0
+
+- New `Glimmer::DataBinding::ObservableHash` support for observing `hash[key]=value` mutations
+- Ensure observed ObservableHash values are enhanced with ObservableHash if they were of type Hash
+- Ensure observed ObservableModel values are enhanced with ObservableHash if they were of type Hash
+
 ### 2.1.5
 
 - Upgrade array_include_methods gem to version 1.4.0 (and fix minor version)
 - Update API usage of `Array#include_all?` in `Glimmer::DataBinding::ObservableArray` to splat array (now required)
 