Update image url

Author: moritzfl

README.md

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 # Sorting Algorithms
 
-![Screenshot](http://www.moritzf.de/projects/img/sorting.png)
+![Screenshot](http://www.moritzf.de/projects/media/sorting.png)
 
 This software was developed with the aim to enrich teaching and learning in the area of algorithms with new possibilities. It is licensed under the terms of GPL v3.