update README

Author: sreichl

README.md

@@ -4,7 +4,7 @@
 [![](https://tokei.rs/b1/github/epigen/unsupervised_analysis?category=files)]()
 [![GitHub license](https://img.shields.io/github/license/epigen/unsupervised_analysis)](https://github.com/epigen/unsupervised_analysis/blob/master/LICENSE)
 ![GitHub Release](https://img.shields.io/github/v/release/epigen/unsupervised_analysis)
-[![Snakemake](https://img.shields.io/badge/Snakemake->=8-green)](https://snakemake.readthedocs.io/en/stable/)
+[![Snakemake](https://img.shields.io/badge/Snakemake->=8.20.1-green)](https://snakemake.readthedocs.io/en/stable/)
 
 
 # Unsupervised Analysis Workflow