New field to store last update in Affiliates items
When visiting an Affiliate page it is not possible to know when the information was last updated.
We've though that the best solution is to create a custom field to have the last date when information was updated. It will be displayed at the bottom of the affiliate single page.
We discarded the solution of displaying the last update of the post, because sometimes we enter and edit something like a typo, but that doesn't mean that this is the last date the numbers where updated.