Method to add data to a batch item as part of process()

[Pdavis23]

Hi,

Brilliant plugin - so useful, thank you!

I was thinking it might be useful to add a method to add data from a processed batch item to the array of batch items available in finish().
Inside finish we have the $this->items property which we can use to loop over the items that have been processed.
However it might be useful, whilst we are processing an item, to be able to update that batch-item in the $this->items array with data.

Use case:

1. Importing posts from a JSON file with meta-data.
2. When I create a post in process(), I could store the generated WP Post ID back into $this->items[>>currently-being-processed-item<<].
3. This would mean when I'm checking things in "finish()" I can quickly get access to the ID of the post created.

Thanks again,

Patrick