Updated the DOI badge to always point to the "latest release".

Author: StuntsPT

README.md

@@ -1,7 +1,10 @@
 # Structure_threader
 A program to parallelize the runs of [Structure](http://pritchardlab.stanford.edu/structure.html) and [fastStructure](https://rajanil.github.io/fastStructure/) software.
 
-[![Build Status](https://travis-ci.org/StuntsPT/Structure_threader.svg?branch=master)](https://travis-ci.org/StuntsPT/Structure_threader) [![Documentation Status](https://readthedocs.org/projects/structure-threader/badge/?version=latest)](http://structure-threader.readthedocs.io/en/latest/?badge=latest) [![DOI](https://zenodo.org/badge/doi/10.5281/zenodo.57262.svg)](http://dx.doi.org/10.5281/zenodo.57262)
+[![Build Status](https://travis-ci.org/StuntsPT/Structure_threader.svg?branch=master)](https://travis-ci.org/StuntsPT/Structure_threader) [![Documentation Status](https://readthedocs.org/projects/structure-threader/badge/?version=latest)](http://structure-threader.readthedocs.io/en/latest/?badge=latest)
+[![DOI](https://zenodo.org/badge/31598374.svg)](https://zenodo.org/badge/latestdoi/31598374)
+
+
 
 
 ## Installation from Pypi