Update 'content/topic/listening-with-the-pandemic.md'

content/topic/listening-with-the-pandemic.md

@@ -1,6 +1,7 @@
 ---
 title: "Listening with the pandemic"
 has_experiments: ["diagnostic-listening.md"]
+has_session: [unsound-2020-session-3.md]
 ---
 ![ML](static/images/02.gif)