fix(doi): update the link to Zenodo DOI.

README.md

@@ -2,7 +2,7 @@
 [![Build Status](https://circleci.com/gh/Scifabric/pybossa/tree/master.svg?style=shield)](https://circleci.com/gh/Scifabric/pybossa)
  [![Coverage Status](https://img.shields.io/coveralls/Scifabric/pybossa.svg)](https://coveralls.io/r/Scifabric/pybossa?branch=master)
 [![Documentation](https://readthedocs.org/projects/pybossa/badge/?version=latest)](http://docs.pybossa.com) [![License](http://img.shields.io/badge/license-agplv3-b75bb6.svg)](http://www.gnu.org/licenses/agpl-3.0.html) [![Join the chat at https://gitter.im/Scifabric/pybossa](https://badges.gitter.im/Scifabric/pybossa.svg)](https://gitter.im/Scifabric/pybossa?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![DOI](https://zenodo.org/badge/12868/PyBossa/pybossa.svg)](https://zenodo.org/badge/latestdoi/12868/PyBossa/pybossa)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3882334.svg)](https://doi.org/10.5281/zenodo.3882334)
 [![Scifabric's Patreon](https://img.shields.io/badge/support%20us%20on-patreon-orange.svg)](https://www.patreon.com/bePatron?u=4979179)
 
 # What is PYBOSSA?