Update azure changelog

Author: markcowl

src/ServiceManagement/Services/Commands.Utilities/ChangeLog.md

@@ -20,6 +20,7 @@
 ## Current Release
 
 * Add-AzureVhd: The size limit on vhd is increased to 4TB.
+* Application Gateway classic, fixed certificate list to work with certificate collections
 
 ## Version 4.0.0
 
@@ -87,4 +88,4 @@
     - Set-AzureManagedCacheNamedCache
 * For more information about Managed Cache service deprecation, see http://go.microsoft.com/fwlink/?LinkID=717458
 
-## Version 3.1.0
+## Version 3.1.0