This release implements a enhancement request to have the post define the parent category for the sub-category list. The first category of the post (the first post is used if more than one are displayed, for example on an archive page) as a parent category. If this category has no sub-categories then the widget is not displayed at all.
You’ll also notice that the exclude categories option is now a multi-selection list (use ctrl click to select more than one category).
The release also improved sanitation and validation of widget input.