chore: update CHANGELOG.md for version 2.3.0-beta.0

Author: lposen

CHANGELOG.md

@@ -1,3 +1,17 @@
+## 2.3.0-beta.0
+
+### Updates
+- Added embedded messaging functionality.  This includes the ability to:
+  - Manually sync the messages with `Iterable.embeddedManager.syncMessages()`
+  - Get the messages with `Iterable.embeddedManager .getMessages([PLACEMENT_IDS])`
+  - Start an embedded session with `Iterable.embeddedManager.startSession()`
+  - End an embedded session with `Iterable.embeddedManager.endSession()`
+  - Start an embedded impression with
+    `Iterable.embeddedManager.startImpression(MESSAGE_ID, PLACEMENT_ID])`
+  - Pause an embedded impression with
+    `Iterable.embeddedManager.pauseImpression(MESSAGE_ID])`
+  - Handle embedded click with `Iterable.embeddedManager.handleClick(message, buttonId, action)`
+
 ## 2.2.0
 
 ### Updates