Add Ruby 3.0 and 3.1 to CI matrix

Author: deivid-rodriguez

.github/workflows/test.yml

@@ -13,10 +13,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, jruby-9.2]
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, jruby-9.2]
         os: [ubuntu-20.04, windows-2019]
         include:
-          - { ruby: 2.7, os: ubuntu-20.04, matrix: pipeline }
+          - { ruby: 3.1, os: ubuntu-20.04, matrix: pipeline }
 
     runs-on: ${{ matrix.os }}