DOC: update CHANGELOG

CHANGELOG.md

@@ -13,11 +13,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   property and optionally removes the property if it is empty afterwards.
 
 ### Changed ###
-* _Messages is now Messages and inherits from list instead of dict
+
+* `_Messages` is now `Messages` and inherits from list instead of dict
+* `Message.__init__` signature changed and expects a `description` now while
+  `type` defaults to "Info" now.
+* `Message.__eq__` changed. Equality is equality of `type`, `code`, and
+  `description` now.
 
 ### Deprecated ###
+
 * The API of Messages has been simplified and some ways to interact with
   messages have been deprecated. Warnings are raised correspondingly.
+* `Message.get_code`. Use the `code` property instead.
 
 ### Removed ###