rate limiting

[mankins]

I ran into a rate limiting issue:

You have exceeded a secondary rate limit and have been temporarily blocked from content creation. Please retry your request again later. (HTTP 403)

To fix this I put a sleep inside the main while loop of the cards. Unfortunately it double-created the failed entries, so you might consider making the sleep the default.

FYI the project had about 50 cards, so it wasn't too big.