Update README.md

README.md

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 A simple PowerShell script to start/stop Azure Virtual Machines. For use with Azure Automation and a Managed Identity.
 The Managed Identity needs the permissions according to [`CustomRoleDefinition.json`](CustomRoleDefinition.json).
 
+Tested with PowerShell 5.1 as a runtime.
+
 ## Features
 
 - Starts/Stops one specific VM or all VMs in a Resource Group
 - Uses the modern ("Az") Azure PowerShell module (instead of the old AzureRm module)
 - Uses Managed Identity instead of RunAs Accounts
+- Supports System-Assigned and User-Assigned Managed Identities (thanks @SanderBlom)
 - Simple
 - Free