Update Jade preprocessor to new Pug name
Update Jade preprocessor to new Pug name

Where it used to say "Jade", it now notes the name  change to "Pug", to avoid confusion!

> Due to a trademark issue, the project name has been changed from “Jade” to “Pug” in conjunction with the release of Pug 2.

(from the [Pug website](https://pugjs.org/api/migration-v2.html))
ngokevin/kframe,ngokevin/kframe