makeup-menu-button: Docs mention non-existent custom events

[backflip]

The component docs mention a makeup-menu-button-select and a makeup-menu-button-change custom event: https://github.com/makeup/makeup-js/tree/master/packages/ui/makeup-menu-button

However, the code is not dispatching any of these: https://github.com/makeup/makeup-js/blob/master/packages/ui/makeup-menu-button/src/index.js

We are currently using instance.menu.el.addEventListener("makeup-menu-select") instead.