title: Shopify variant swatches or radio buttons instead of dropdowns in Slate
body: <p>Shopify's tutorial for <a href="https://help.shopify.com/themes/customization/showcase-products/add-color-swatches" rel="nofollow noreferrer">color swatches</a> isn't supported yet for <a href="https://shopify.github.io/slate/" rel="nofollow noreferrer">Slate</a>,
  and the select callback referenced no longer exists in the code base. Is it possible to modify this tutorial to work on Slate themes to create radio buttons or swatches instead of a dropdown for selecting variants on the product template?</p>