README edit

README.md

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 ### Petsound
 [Petsound](https://www.discogs.com/release/2557998-The-Beach-Boys-Pet-Sounds) is a pillow or plush toy that makes a sound when you pet it. It has a velostat sheet that senses pressure, and we define "petting" as significant variaton of that pressure.
 
-#### [Video](https://tooot.im/@zvinj/113906516287736785)
+#### [Video and "making of" photos](https://tooot.im/@zvinj/113906516287736785)
 
 ![Schematic diagram](petsound_bb.png)