Add Ruby 3.4 to the CI

Author: pitbulk

.github/workflows/test.yml

@@ -24,6 +24,7 @@ jobs:
           - 3.1
           - 3.2
           - 3.3
+          - 3.4
           - jruby-9.1
           - jruby-9.2
           - jruby-9.3

README.md

@@ -51,7 +51,7 @@ We created a demo project for Rails 4 that uses the latest version of this libra
 
 The following Ruby versions are covered by CI testing:
 
-* Ruby (MRI) 2.1 to 3.3
+* Ruby (MRI) 2.1 to 3.4
 * JRuby 9.1 to 9.4
 * TruffleRuby (latest)