Update README.md

Author: rieder

README.md

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 # AMUSE: The Astrophysical Multipurpose Software Environment
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3466805.svg)](https://doi.org/10.5281/zenodo.3466805)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1435860.svg)](https://doi.org/10.5281/zenodo.1435860)
 [![PyPI version](https://badge.fury.io/py/amuse.svg)](https://badge.fury.io/py/amuse)
 
 This repository contains the AMUSE software. With AMUSE you can write