Following the publication of TrelloExport 1.8.8 some days ago, I now pushed on Github an update for this Chrome extension.
New data columns:
The full list of Columns is now:
columnHeadings = ['List', 'Card #', 'Title', 'Link', 'Description', 'Checklists', 'Comments', 'Attachments', 'Votes', 'Spent', 'Estimate', 'Created', 'CreatedBy', 'Due', 'Done', 'DoneBy', 'Members', 'Labels']
These fields are calculated intercepting when a card was moved to the Done list. While bmccormack's code only checks for this list, I check for cards being moved to any list whose name starts with "Done" (e.g. using lists named "Done Bugfix", "Done New Feature" and so will work).
Grab TrelloExport from Github at https://github.com/trapias/trelloExport