Move versions back under header

(cherry picked from commit 2bf7085)

Author: chadlwilson

README.md

@@ -1,8 +1,8 @@
+# JRuby-Rack
+
 [![Gem Version](https://badge.fury.io/rb/jruby-rack.png)][8]
 [![Build Status](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml/badge.svg)][9]
 
-# JRuby-Rack
-
 JRuby-Rack is a lightweight adapter for the Java Servlet environment that allows
 any (Ruby) Rack-based application to run unmodified in a Java Servlet container.
 JRuby-Rack supports Rails as well as any Rack-compatible Ruby web framework.