Update screenshot in readme

Change-Id: I335736e9e618a7ea2fd84658a9265d02d0ebeafc
diff --git a/dev/demo/img/screenshots.png b/dev/demo/img/screenshots.png
index 85bd692..987cad4 100644
--- a/dev/demo/img/screenshots.png
+++ b/dev/demo/img/screenshots.png
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