Adding release date to CHANGELOG (Azure#29063)

Co-authored-by: Yogesh Mohanraj <ymohanraj@microsoft.com>

Author: yogeshmo

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

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.0.0b2 (Unreleased)
+## 1.0.0b2 (2023-03-01)
 
 ### Features Added
 - Adding support for AAD token authentication
@@ -17,8 +17,6 @@
 - Custom headers in the email message are now key/value pairs.
 - The importance property was removed. Email importance can now be specified through either the `x-priority` or `x-msmail-priority` custom headers.
 
-### Bugs Fixed
-
 ### Other Changes
 Python 3.6 is no longer supported. Please use Python version 3.7 or later. For more details, please read our page on [Azure SDK for Python version support policy](https://github.com/Azure/azure-sdk-for-python/wiki/Azure-SDKs-Python-version-support-policy).