fix link

Author: Samuel Gratzl

README.md

@@ -2,7 +2,7 @@ LineUp.js as htmlwidget
 =======================
 
 LineUp is an interactive technique designed to create, visualize and explore rankings of items based on a set of heterogeneous attributes. 
-This is a [htmlwidget](http://www.htmlwidgets.org/) wrapper around the JavaScript library [LineUp.js](https://github.com/lineupjs). Details about the LineUp visualization technique can be found at http://lineup.caleydo.org
+This is a [htmlwidget](http://www.htmlwidgets.org/) wrapper around the JavaScript library [LineUp.js](https://github.com/Caleydo/lineupjs). Details about the LineUp visualization technique can be found at http://lineup.caleydo.org
 
 Installation
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