Issue title: A problem with "collection" when generating bulk
 Issue body: I have a problem when generating my art, it doesn't add the collection data in each JSON file.

Is there an updated version or a way around this, thanks in advance! 
 Comments: 
 Comment 0: @LaugeBirchLorup what do you mean by 'collection data'?
 Comment 1: @bolshoytoster There's a URI specifically for the collection to show the overall collection image and name
 Comment 2: @LaugeBirchLorup you could try running `node utils/update_info.js`
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