[feature] versions:parent-updates-report should respect reports format

[Jiehong]

Hello,

If I run mvn versions:property-updates-report, I can tell it to produce a report in xml through the formats option.

However, if I run mvn versions:parent-updates-report, then this option does not exist, and no xml report is generated.

It would be nice if versions:parent-updates-report could respect the exact same formats options as versions:property-updates-report, and possibly the same xml structure too.