Update DOI badge

Author: krasserm

README.md

@@ -1,6 +1,6 @@
 ## Bayesian machine learning notebooks
 
-[![DOI](https://zenodo.org/badge/125869131.svg)](https://zenodo.org/badge/latestdoi/125869131)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.4050922.svg)](https://doi.org/10.5281/zenodo.4050922)
 
 This repository is a collection of notebooks related to *Bayesian Machine Learning*. The following links display 
 some of the notebooks via [nbviewer](https://nbviewer.jupyter.org/) to ensure a proper rendering of formulas.