Duplicate artboard rather than replace

[ghost]

First off, I love this plugin. I'm using it with a copywriter on staff to make quick edits to designer's documents as well as to batch produce visual artifacts that require lots of text.

It would be really keen if the original artboard was copied with the changes in addition to the original. It would be even more cool if I could simply copy the json body to add another duplicate artboard with potentially different copy.

For example, if the artboard was a playing card I could batch produce a set of different cards from an archetypal example.

cheers! #enhancement ?