Add changelog for storagev2

Author: blueww

src/ResourceManager/Storage/ChangeLog.md

@@ -18,7 +18,10 @@
         - Additional information about change #1
 -->
 ## Current Release
-
+* Upgrade SRP SDK to 7.1.0
+* Add StorageV2 account kind to resource mode storage account cmdlets
+    - New-AzureRmStorageAccount
+	
 ## Version 4.0.1
 * Fixed assembly loading issue that caused some cmdlets to fail when executing