Add link to last release

README.md

@@ -3,6 +3,7 @@
 [![https://www.singularity-hub.org/static/img/hosted-singularity--hub-%23e32929.svg](https://www.singularity-hub.org/static/img/hosted-singularity--hub-%23e32929.svg)](https://singularity-hub.org/collections/4724)
 [![DOI:10.1101/2020.09.11.293472](https://zenodo.org/badge/DOI/10.1101/2020.09.11.293472.svg)](https://doi.org/10.1101/2020.09.11.293472)
 
+[![GitHub release](https://img.shields.io/github/release/gem-pasteur/PanACoTA.svg)](https://github.com/gem-pasteur/PanACoTA/releases)
 [![pipeline status](https://gitlab.pasteur.fr/aperrin/pipeline_annotation/badges/master/pipeline.svg)](https://gitlab.pasteur.fr/aperrin/pipeline_annotation/-/pipelines)
 <!---
 [![coverage report](https://gitlab.pasteur.fr/aperrin/pipeline_annotation/badges/master/coverage.svg)](http://aperrin.pages.pasteur.fr/pipeline_annotation/htmlcov)