Error with old Versions of Windows / PowerShell

[akwitt]

Thanks for this useful check!

On older systems there is no Get-LocalGroupMember Cmdlet - the check will crash with ValueError ('summary' must be non-empty str or None, got )
This PS module seems to come with Version 5.1 (WMF 5.1)

I propose two solutions:

1. write a routine using WMIC if the Cmdlet is not found (not worth it in my opinion)
2. let the script return an error code if (Get-Host).Version -lt [System.Version]"5.1" or maybe (Get-Command Get-LocalGroupMember -ErrorAction SilentlyContinue) -eq $null

Could do a PR if you want but I am new to custom plugins and don't want to break anything