Currently versions are sorted alphabetically. However, it's much better to use natural sort order. This is the same sort order you see in Windows Explorer or Mac's Finder. Jeff Atwood on Natural Sort Order.
So instead of [1.10, 1.11, 1.8, 1.9, 2.0] the desired output is [1.8, 1.9, 1.10, 1.11, 2.0].
Moreover, most important versions are the last ones. So it would be great to have an option to reverse the version list: [2.0, 1.11, 1.10, 1.9, 1.8]
I've attached a screenshot with the current behavior.