Update README.md

Author: paulgovan

README.md

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 ![](https://travis-ci.org/paulgovan/BayesianNetwork.svg?branch=master)
 [![Rdoc](http://www.rdocumentation.org/badges/version/eAnalytics)](http://www.rdocumentation.org/packages/eAnalytics) 
 [![DOI](https://zenodo.org/badge/35055898.svg)](https://zenodo.org/badge/latestdoi/35055898)
+[![DOI](http://doi.org/10.5334/jors.144 )](http://doi.org/10.5334/jors.144 )
 
 # Features
 * Profile: take an overview of the industry