Auto merge of #4099 - Turbo87:top-versions, r=JohnTitor
Auto merge of #4099 - Turbo87:top-versions, r=JohnTitor

models::Krate: Change `top_versions()` to query `created_at` instead of `updated_at`

If a version is yanked and unyanked it shouldn't show up as the "newest" version, if there are legitimately newer versions available.

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io