Update README.md

SIW Performance Graphs Added from p. 9 of http://mklab.iti.gr/files/beis_adbis2014_corrected.pdf

Author: NDuma

Diff for: README.md

@@ -114,11 +114,14 @@ Below we list the results of MIW and QW for each dataset.
 
 ####SIW results
 Below we list the results of SIW for each dataset.
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+![siw_benchmark_updated](https://cloud.githubusercontent.com/assets/8163869/12272282/62b1c9f4-b914-11e5-85be-efd3f58e1e05.png)
+<!---
 ![alt text](https://raw.githubusercontent.com/socialsensor/graphdb-benchmarks/master/images/SIWEnron.png "Logo Title Text 1")
 ![alt text](https://raw.githubusercontent.com/socialsensor/graphdb-benchmarks/master/images/SIWAmazon.png "Logo2 Title Text 1")
 ![alt text](https://raw.githubusercontent.com/socialsensor/graphdb-benchmarks/master/images/SIWYoutube.png "Logo Title Text 1")
 ![alt text](https://raw.githubusercontent.com/socialsensor/graphdb-benchmarks/master/images/SIWLivejournal.png "Logo4 Title Text 1")
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 Contact
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