The USB Promoter Group published the latest specification of Power Delivery in May of last year, but accessory manufacturers are only now delivering products that support it. And it’s about time because 16-inch MacBook Pro users who swear by fast charging have been stuck with the included non-travel-friendly brick that only has one USB-C port. Now you can get ones with multiple ports, giving you the flexibility to share all that power with a phone, tablet, or even another laptop along with…