message: docs(resolver): Comment for what the minimal_versions flag does
diff: @@ -687,6 +687,9 @@ struct RegistryQueryer<'a> {
  try_to_use: &'a HashSet<&'a PackageId>,
  // TODO: with nll the Rc can be removed
  cache: HashMap<Dependency, Rc<Vec<Candidate>>>,
  + // If set the list of dependency candidates will be sorted by minimal
  + // versions first. That allows `cargo update -Z minimal-versions` which will
  + // specify minimum depedency versions to be used.
  minimal_versions: bool,
  }
  