Data attribute for Adobe Illustrator and the kind

[diroru]

Dear Kartographer-Dev,

first of all thanks for this utterly marvelous piece of software (… and documentation)!

A tiny correction, which could make following the tutorial a bit smoother for beginners:

When trying to specify the id attribute for vector art editing software (and using the standard naturalearth data) the proper reference for the "ISO3"-attribute seems to be "iso_a3" (case sensitive). Also, it required some attempts before it became clear that the underscore will be converted to a dash. ("iso_a3" -> "data-iso-a3").

Hopefully this remark is worthy of your attention :)

Thanks again for Kartographer!

Keep up the good work!
Cheers,

Dimitar