I recently committed the following change to the Development Version of FeedWordPress:
2017.1020: Significant new feature -- Boilerplate / Credits setting panel brought into off-the-shelf FeedWordPress feature set. Smaller bugfixes, PHP 7.1+ compatibility tweaks, etc.
This change will be part of the next public release of FeedWordPress. Interested? Curious? You can check out the details at the WordPress plugin repository ...