Fix missing DOI Zenodo badge

README.md

@@ -5,6 +5,7 @@ The ProteoGenomics database generation workflow (**pgdb**) use the [pypgatk](htt
 [![GitHub Actions CI Status](https://github.com/nf-core/pgdb/workflows/nf-core%20CI/badge.svg)](https://github.com/nf-core/pgdb/actions)
 [![GitHub Actions Linting Status](https://github.com/nf-core/pgdb/workflows/nf-core%20linting/badge.svg)](https://github.com/nf-core/pgdb/actions)
 [![Nextflow](https://img.shields.io/badge/nextflow-%E2%89%A520.04.0-brightgreen.svg)](https://www.nextflow.io/)
+[![Cite with Zenodo](http://img.shields.io/badge/DOI-10.5281/zenodo.4722661-1073c8?labelColor=000000)](https://doi.org/10.5281/zenodo.4722661)
 
 [![install with bioconda](https://img.shields.io/badge/install%20with-bioconda-brightgreen.svg)](https://bioconda.github.io/)
 [![Docker](https://img.shields.io/docker/automated/nfcore/pgdb.svg)](https://hub.docker.com/r/nfcore/pgdb)