Add 1.2-stable status to README

(cherry picked from commit fafb859)

Author: chadlwilson

README.md

@@ -1,8 +1,9 @@
 # JRuby-Rack
 
-[![Gem Version](https://badge.fury.io/rb/jruby-rack.png)][5]
-[![Build Status](https://github.com/jruby/jruby-rack/actions/workflows/maven.yml/badge.svg)][6]
-
+[![Gem Version](https://badge.fury.io/rb/jruby-rack.png)](http://badge.fury.io/rb/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)
+[![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)
+ 
 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.
@@ -369,9 +370,6 @@ package and push the .jar every time a commit changes a source file).
 Please use [github][3] to file bugs, patches and/or pull requests.
 More information at the [wiki][4] or ask us at **#jruby**'s IRC channel.
 
-[1]: https://github.com/jruby/warbler#warbler--
 [2]: https://central.sonatype.com/artifact/org.jruby.rack/jruby-rack
 [3]: https://github.com/jruby/jruby-rack/issues
 [4]: https://github.com/jruby/jruby-rack/wiki
-[5]: http://badge.fury.io/rb/jruby-rack
-[6]: https://github.com/jruby/jruby-rack/actions/workflows/maven.yml