Updating changelog

Author: Khushboo Baheti

src/Network/Network/ChangeLog.md

@@ -20,6 +20,7 @@
 
 ## Upcoming Release
 * Fix incorrect parameter description in `New-AzApplicationGatewaySku` reference documentation
+* Fix required subnet with name AzureBastionSubnet in `PSBastion` can be case insensitive
 
 ## Version 1.15.0
 * Add new cmdlet Get-AzAvailableServiceAlias which can be called to get the aliases that can be used for Service Endpoint Policies.