Add badge for 3.x version

Author: slawekjaranowski

README.md

@@ -19,6 +19,7 @@ Apache Maven
 
 [![ASF Jira](https://img.shields.io/endpoint?url=https%3A%2F%2Fmaven.apache.org%2Fbadges%2Fasf_jira-MNG.json)][jira]
 [![Apache License, Version 2.0, January 2004](https://img.shields.io/github/license/apache/maven.svg?label=License)][license]
+[![Maven Central](https://img.shields.io/maven-central/v/org.apache.maven/apache-maven.svg?label=Maven%20Central&versionPrefix=3.)](https://search.maven.org/artifact/org.apache.maven/apache-maven)
 [![Maven Central](https://img.shields.io/maven-central/v/org.apache.maven/apache-maven.svg?label=Maven%20Central)](https://search.maven.org/artifact/org.apache.maven/apache-maven)
 [![Reproducible Builds](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/jvm-repo-rebuild/reproducible-central/master/content/org/apache/maven/maven/badge.json)](https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/maven/maven/README.md)
 [![Jenkins Status](https://img.shields.io/jenkins/s/https/ci-maven.apache.org/job/Maven/job/maven-box/job/maven/job/master.svg?)][build]