add link to GitMinutes episode #32

Author: aspiers

README.md

@@ -9,6 +9,9 @@ a screencast demonstration:
 
 [![YouTube screencast](./html/images/youtube-thumbnail.png)](http://youtu.be/irQ5gMMz-gE)
 
+I also spoke about the tool in
+[episode #32 of the GitMinutes podcast](http://episodes.gitminutes.com/2015/03/gitminutes-32-adam-spiers-on-git-deps.html).
+
 Background theory
 -----------------