Merge pull request #3099 from element-hq/fkwp/update_readme

Update readme with new Element Call screenshot

Author: fkwp

README.md

@@ -20,7 +20,7 @@ utilizes
 **[MSC4195](https://github.com/hughns/matrix-spec-proposals/blob/hughns/matrixrtc-livekit/proposals/4195-matrixrtc-livekit.md)**
 with **[LiveKit](https://livekit.io/)** as its backend.
 
-![A demo of Element Call with six people](demo.jpg)
+![A demo of Element Call with six people](demo.gif)
 
 You can find the latest development version continuously deployed to
 [call.element.dev](https://call.element.dev/).

demo.gif

@@ -89,7 +89,7 @@ to implement
     {
         "type": "another_foci",
         "props_for_another_foci": "val"
-    },
+    }
 ]
 ```