Update README.md

README.md

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+[ ![Documentation](https://img.shields.io/badge/sphinx-documentation-informational.svg)](https://openclsim.readthedocs.io)
+[ ![License: MIT](https://img.shields.io/badge/License-MIT-informational.svg)](https://github.com/TUDelft-CITG/OpenCLSim/blob/master/LICENSE.txt)
+[ ![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3251546.svg)](https://doi.org/10.5281/zenodo.3251546)
+
 [![CircleCI](https://circleci.com/gh/TUDelft-CITG/OpenCLSim.svg?style=svg&circle-token=fc95d870dc21fdf11e1ebc02f9defcd99212197a)](https://circleci.com/gh/TUDelft-CITG/OpenCLSim)
-[ ![Documentation](https://img.shields.io/badge/sphinx-documentation-brightgreen.svg)](https://openclsim.readthedocs.io)
-[ ![License: MIT](https://img.shields.io/badge/License-MIT-brightgreen.svg)](https://github.com/TUDelft-CITG/OpenCLSim/blob/master/LICENSE.txt)
 
 # OpenCLSim
 
-Open Source Complex Logistics Simulation - Rule based planning of cyclic activities for in-depth comparison of different system concepts.
+Open Source Complex Logistics Simulation - Rule driven scheduling of cyclic activities for in-depth comparison of alternative operating strategies.
 
 Documentation can be found [here](https://openclsim.readthedocs.io).