Remove devDependencies badge

Author: keimlink

README.md

@@ -4,7 +4,6 @@
 [![Docker Stars](https://img.shields.io/docker/stars/keimlink/sphinx-doc.svg)](https://hub.docker.com/r/keimlink/sphinx-doc/ "Docker Stars")
 [![Docker Pulls](https://img.shields.io/docker/pulls/keimlink/sphinx-doc.svg)](https://hub.docker.com/r/keimlink/sphinx-doc/ "Docker Pulls")
 [![Python Dependency Updates](https://pyup.io/repos/github/keimlink/docker-sphinx-doc/shield.svg)](https://pyup.io/repos/github/keimlink/docker-sphinx-doc/ "Python Dependency Updates")
-[![devDependencies Status](https://david-dm.org/keimlink/docker-sphinx-doc/dev-status.svg)](https://david-dm.org/keimlink/docker-sphinx-doc?type=dev "devDependencies Status")
 [![Renovate enabled](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://renovateapp.com/ "Renovate enabled")
 [![License](https://img.shields.io/github/license/keimlink/docker-sphinx-doc.svg)](https://github.com/keimlink/docker-sphinx-doc/blob/develop/LICENSE "License")