Merge pull request python3statement#185 from Conengmo/patch-1

Add folium to participating projects

Author: takluyver

_sections/30-projects.md

@@ -75,6 +75,7 @@ for some that aren't directly comparable. -->
 
 &nbsp; <!--break separating project with image from without -->
 
+- [folium](https://github.com/python-visualization/folium)
 - [better-exceptions](https://github.com/qix-/better-exceptions)
 - [umap-learn](https://github.com/lmcinnes/umap)
 - [hdbscan](https://github.com/scikit-learn-contrib/hdbscan)