tribute-rb v3.6.0.0 Does not have `itemClass` option within collections

[Keith Long]

I would like to be able to customize the itemClass.
The tribute ReadMe.md alluded to this being possible, but looks like it's not included in the ruby fork. ie.

  // class added to the menu container
  containerClass: 'tribute-container',

  // class added to each list item
  itemClass: '',

How can I best customize this? Is a release possible to get the latest?
thanks