Update README.md

Detective Squirrel [2016-07-23 20:18:53]
Update README.md
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README.md
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 # Pokemon-Go-Rocket-API
-![alt tag](https://github.com/DetectiveSquirrel/Pokemon-Go-Rocket-API/blob/master/screenshot.jpg)
+![alt tag](https://github.com/DetectiveSquirrel/Pokemon-Go-Rocket-API/blob/master/screenshot.png)

 A Pokemon Go bot in C#
You may download the files in Public Git.