According to the documentation:

# Use bootstrap4 template
RANGE_PAGINATOR_TEMPLATE = 'django_rangepaginator/bootstrap3.html'

# Use bootstrap3 template (default)
RANGE_PAGINATOR_TEMPLATE = 'django_rangepaginator/bootstrap4.html'

I think the Bootstrap versions in the comments are switched here.

Write docs with Sphinx.

Seems like the project is ready to be released. I need to write nice documentation and post it on read-the-docs.

pagination schema should be configurable as per user requirements

example:

        {
            "total": 100,
            "pages": 20,
            "next": "/campaign?page=2&size=20",
            "prev":  "/campaign?page=1&size=20",
            "results": [
                // example data
            ]
        }

fields should be configurable

I think the footer currently in landing page should be implemented to every news page since landing page is now going. Also it looks little incomplete currently. The links like privacy policy, source code, go to top arrow are few things to add there. Although it would be nice to have go to top / bottom every time while scrolling as well