public View getFooterView(@SuppressWarnings("unused") final ViewGroup parent) {
        throw new UnsupportedOperationException(
                "You need to implement getFooterView() if you set footerViewWillBeProvided");
    }
Creates the View for the Footer. This must be implemented if and only if
{@link #isFooterViewWillBeProvided()} is true.

@param parent The parent view. Note that there is no need to attach the new view.
@return View for the Footer of this Section.
library/src/main/java/io/github/luizgrp/sectionedrecyclerviewadapter/Section.java