use new Reproducible Central badge endpoint

Author: hboutemy

README.md

@@ -4,5 +4,6 @@ Plexus-Velocity
 [![Apache License, Version 2.0, January 2004](https://img.shields.io/github/license/codehaus-plexus/plexus-velocity.svg?label=License)](http://www.apache.org/licenses/)
 [![Maven Central](https://img.shields.io/maven-central/v/org.codehaus.plexus/plexus-velocity.svg?label=Maven%20Central)](https://search.maven.org/artifact/org.codehaus.plexus/plexus-velocity)
 [![Build Status](https://travis-ci.org/codehaus-plexus/plexus-velocity.svg?branch=master)](https://travis-ci.org/codehaus-plexus/plexus-velocity)
+[![Reproducible Builds](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/jvm-repo-rebuild/reproducible-central/master/content/org/codehaus/plexus/plexus-velocity/badge.json)](https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/content/org/codehaus/plexus/plexus-velocity/README.md)
 
 The canonical git repository is located at https://github.com/codehaus-plexus/plexus-velocity