Add drf-proxy-pagination reference to Pagination docs

Author: tuffnatty

docs/api-guide/pagination.md

@@ -321,9 +321,14 @@ The following third party packages are also available.
 
 The [`DRF-extensions` package][drf-extensions] includes a [`PaginateByMaxMixin` mixin class][paginate-by-max-mixin] that allows your API clients to specify `?page_size=max` to obtain the maximum allowed page size.
 
+## drf-proxy-pagination
+
+The [`drf-proxy-pagination` package][drf-proxy-pagination] includes a `ProxyPagination` class which allows to choose pagination class with a query parameter.
+
 [cite]: https://docs.djangoproject.com/en/dev/topics/pagination/
 [github-link-pagination]: https://developer.github.com/guides/traversing-with-pagination/
 [link-header]: ../img/link-header-pagination.png
 [drf-extensions]: http://chibisov.github.io/drf-extensions/docs/
 [paginate-by-max-mixin]: http://chibisov.github.io/drf-extensions/docs/#paginatebymaxmixin
+[drf-proxy-pagination]: https://github.com/tuffnatty/drf-proxy-pagination
 [disqus-cursor-api]: http://cramer.io/2011/03/08/building-cursors-for-the-disqus-api