Update revealjs.yml

(cherry picked from commit 97f6d07)

Author: kapsner

docs/extensions/listings/revealjs.yml

@@ -23,6 +23,14 @@
   description: >
     Display attribution text along the right edge of slides.
 
+- name: audio-slideshow
+  path: https://github.com/kapsner/audio-slideshow
+  author:
+  - '[Lorenz A. Kapsner](https://github.com/kapsner)'
+  - '[Asvin Goel](https://github.com/rajgoel)'
+  description: >
+    Adds the option to add/record audio playback to each slide of the presentation.
+
 - name: auto-agenda
   path: https://github.com/andrie/reveal-auto-agenda
   author: '[andrie](https://github.com/andrie)'