Updated release data for chat java from 09/27 to 09/15 (Azure#24157)

Co-authored-by: Andrei Giurgiu <agiurg@microsoft.com>

Author: angiurgiu

sdk/communication/azure-communication-chat/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.1.0 (2021-09-27)
+## 1.1.0 (2021-09-15)
 - Added javadoc code samples
 - Removed redundant overload `ChatThreadAsyncClient.sendTypingNotification(TypingNotificationOptions options)`
 - Upgraded `azure-communication-common` to 1.0.4