[chore] Link Maven Central

Author: chadlwilson

README.md

@@ -1,6 +1,7 @@
 # JRuby-Rack
 
-[![Gem Version](https://badge.fury.io/rb/jruby-rack.png)](http://badge.fury.io/rb/jruby-rack)
+[![Gem Version](https://img.shields.io/gem/v/jruby-rack)](https://rubygems.org/gems/jruby-rack)
+[![Jar Version](https://img.shields.io/maven-central/v/org.jruby.rack/jruby-rack)](https://central.sonatype.com/artifact/org.jruby.rack/jruby-rack)
 [![master Build Status](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml/badge.svg)](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml?query=branch%3Amaster) (master)
 [![1.2.x Build Status](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml/badge.svg?branch=1.2-stable)](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml?query=branch%3A1.2-stable) (1.2.x)