Update README.md

README.md

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 # PixiEditor
 Pixi is lightweighted pixel art creator.
 
-![ss](https://user-images.githubusercontent.com/25402427/46804050-fb832d80-cd61-11e8-9df6-f9fafd3fa354.jpg)
+![screenshot](https://raw.githubusercontent.com/flabbet/PixiEditor/master/Screenshot.png)
 
 ## Getting started with Pixi