Update README.md

Author: Aurélien Ooms

README.md

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 [js-sort](http://aureooms.github.io/js-sort)
 ==
 
+<img src="http://www.explainxkcd.com//wiki/images/b/bc/ineffective_sorts.png" width="864">
+
 Sorting algorithms for JavaScript. Parent is
 [aureooms/js-algo](https://github.com/aureooms/js-algo).