FIX: README.md: readthedocs badge

README.md

@@ -3,7 +3,7 @@
 
 <p align="center">
   <a href="https://github.com/galantelab/sideRETRO/actions/workflows/ci.yml"><img alt="" src="https://github.com/galantelab/sideRETRO/actions/workflows/ci.yml/badge.svg?branch=master" align="center"></a>
-  <a href="https://sideretro.readthedocs.io/en/latest/?badge=latest"><img alt="" src="https://readthedocs.org/projects/sideretro/badge/?version=latest" align="center"></a>
+  <a href="https://sideretro.readthedocs.io/en/stable/?badge=stable"><img alt="" src="https://readthedocs.org/projects/sideretro/badge/?version=stable" align="center"></a>
   <a href="https://coveralls.io/github/galantelab/sideRETRO?branch=master"><img alt="" src="https://coveralls.io/repos/github/galantelab/sideRETRO/badge.svg?branch=master" align="center"></a>
   <a href="https://hub.docker.com/r/galantelab/sider/tags"><img alt="" src="https://img.shields.io/badge/docker-%230db7ed.svg?style=flat&logo=docker&logoColor=white" align="center"></a>
 </p>