Update README.md

Author: vatj

README.md

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 # Genotype-Phenotype Map Integer Polyomino
 [![Build Status](https://travis-ci.org/vatj/gpmap_integer_polyomino.svg?branch=master)](https://travis-ci.org/vatj/gpmap_integer_polyomino)
-![GitHub](https://img.shields.io/github/license/vatj/gpmap_integer_polyomino)
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 Code repository for the analysis of the Genotype-Phenotype Map Properties of the Integer Polyomino Model.