Add link to IBA repo

Author: ls1xt

README.md

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 # Code for the Paper "Restricting the Flow: Information Bottlenecks for Attribution"
 
+For an **easy-to-use implementation** (nice API, examples & documentatio), see [BioroboticsLab/IBA](https://github.com/BioroboticsLab/IBA).
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 This is the source code for the paper ["Restricting the Flow: Information Bottlenecks for Attribution"](https://openreview.net/forum?id=S1xWh1rYwB) accepted as an Oral at ICLR2020.
 <p align="center"> 
     <img alt="Example GIF" width="300" src="monkeys.gif"><br>