docs: add reactstrap-scrollspy to the in the wild section (#82) (#1622)

README.md

@@ -264,6 +264,7 @@ Organizations and projects using `reactstrap`
 - [Admin dashboard example app built with reactstrap](https://github.com/reduction-admin/react-reduction) - [demo](https://reduction-admin.firebaseapp.com/)
 - [DevExtreme React Grid](https://devexpress.github.io/devextreme-reactive/react/grid/) - It's a stateless data grid built on top of `reactstrap` with paging, sorting, filtering, grouping, selection, editing and virtual scrolling features.
 - [DevExtreme React Chart](https://devexpress.github.io/devextreme-reactive/react/chart/) - A chart built on top of `reactstrap` that visualizes data using a variety of series types, including bar, line, area, scatter, pie, and more.
+- [reactstrap-scrollspy](https://github.com/keidrun/reactstrap-scrollspy/) - [demo](https://keidrun.github.io/reactstrap-scrollspy/)
 
 Submit a PR to add to this list!