Merge pull request #415 from petergoldstein/feature/add_ruby_3_1_to_ci

Add Ruby 3.1 to the CI matrix

Author: hsbt

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ 'ubuntu-latest', 'macos-latest', 'windows-latest' ]
-        ruby: [ '3.0', 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, jruby, jruby-head, truffleruby, ruby-head ]
+        ruby: [ 3.1, '3.0', 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, jruby, jruby-head, truffleruby, ruby-head ]
         exclude:
           - os: windows-latest
             ruby: truffleruby