Modify changelog for blobs (#10248)

* Modify changelog

* title

Author: rakshith91

sdk/storage/azure-storage-blob/CHANGELOG.md

@@ -1,6 +1,10 @@
 # Release History
 
-## 12.2.1 (2020-03-10)
+## 12.3.0 (2020-03-10)
+
+**New features**
+
+- `stage_block` now propagates the response from the service.
 
 **Fixes**
 - Fixed a bug where a new transport is being passed in the `get_blob_client` method instead

sdk/storage/azure-storage-blob/azure/storage/blob/_version.py

@@ -4,4 +4,4 @@
 # license information.
 # --------------------------------------------------------------------------
 
-VERSION = "12.2.1"
+VERSION = "12.3.0"