Updated Readme

GitHub caches embedded images and does a very poor job in doing so ... Had to rename the image.
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-![Krill](http://nils-diewald.de/temp/krill-logo.png)
+![Krill](http://nils-diewald.de/temp/krill.png)
 
 A Corpusdata Retrieval Index using Lucene for Look-Ups