Fix Docker badge

README.md

@@ -10,7 +10,7 @@ command line tools:
 
 [![Build Status](https://travis-ci.org/kiwix/kiwix-tools.svg?branch=master)](https://travis-ci.org/kiwix/kiwix-tools)
 [![AUR version](https://img.shields.io/aur/version/kiwix-tools)](https://aur.archlinux.org/packages/kiwix-tools/)
-[![Docker Build Status](https://img.shields.io/docker/build/kiwix/kiwix-serve)](https://hub.docker.com/r/kiwix/kiwix-serve)
+[![Docker Build Status](https://img.shields.io/docker/cloud/build/kiwix/kiwix-serve)](https://hub.docker.com/r/kiwix/kiwix-serve)
 [![CodeFactor](https://www.codefactor.io/repository/github/kiwix/kiwix-tools/badge)](https://www.codefactor.io/repository/github/kiwix/kiwix-tools)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)