Test across multiple versions of Ruby

Author: mvandervoord

.github/workflows/main.yml

@@ -15,6 +15,9 @@ jobs:
   unit-tests:
     name: "Unit Tests"
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby: ['2.7', '3.0', '3.1', '3.2']
     steps:
       # Install Ruby Testing Tools
       - name: Setup Ruby Testing Tools