Officially official

When I first wrote this, the go-acme team wasn't publishing Docker images for armv8, so rather than building my own I found someone else's and used that. This release switches to the official Lego Docker image as they are now building for armv8.

There's nothing else in this release other than a comment update, so you don't have to rush out and upgrade if you're not concerned with not running the official Docker image.