Once upon a time, charging a MacBook and an iPhone was enough for most people, but with the advent of AirPods, and Apple Watches, and iPads, and Apple Pencils, one USB port often just doesn’t cut it anymore. That’s why Twelve South has released PlugBug Duo — an updated version of its 2014 PlugBug World travel adapter kit that doubles the number of USB ports of the previous model, providing two USB-A ports that can delivered a combined…