add verbose message for flatten directory

scripts/utils.ps1

@@ -49,6 +49,7 @@ function Create-Archive($source, $target, $params) {
 # Flatten it instead
 function Flatten-Directory($name) {
     $child = (Get-Childitem $name)[0]
+    Write-Verbose "Moving the '$child' directory's content to '$name'"
     Rename-Item $name -NewName "$($name)_moving"
     Move-Item -Path "$($name)_moving\$child" -Destination $name
     Remove-Item -Recurse "$($name)_moving"