message: Introduce `Eq` requirement to build a `PickList`
diff: @@ -52,7 +52,7 @@ impl<T> Default for State<T> {
  impl<'a, T: 'a, Message, Renderer: self::Renderer>
  PickList<'a, T, Message, Renderer>
  where
  - T: ToString,
  + T: ToString + Eq,
  [T]: ToOwned<Owned = Vec<T>>,
  {
  /// Creates a new [`PickList`] with the given [`State`], a list of options,
  