Added link to PyOhio 2019 presentation video

Author: tleonhardt

PyOhio_2019/README.md

@@ -1,6 +1,5 @@
-# PyOhio 2019 
+# PyOhio 2019
 
 ## A Hands-on Guide to Building Interactive Command-Line Apps with cmd2
-This directory contains material for a [talk](https://www.pyohio.org/2019/presentations/68) presented at the 
-[PyOhio 2019](https://www.pyohio.org/2019/) conference in Columbus, OH by Todd Leonhardt and Kevin Van Brunt.
-
+This directory contains material for a [talk](https://www.pyohio.org/2019/presentations/68) presented at the
+[PyOhio 2019](https://www.pyohio.org/2019/) conference in Columbus, OH by Todd Leonhardt and Kevin Van Brunt.  [Video](https://www.youtube.com/watch?v=pebeWrTqIIw) of the presentation is avilable on YouTube.