Test on Ruby 3.0 and 3

Author: PetrHeinz

.github/workflows/main.yml

@@ -15,18 +15,19 @@ jobs:
 
       matrix:
         ruby-version:
-          - 3.2
-          - 3.1
-          - 3.0
-          - 2.7
-          - 2.6
-          - 2.5
-          - 2.4
-          - 2.3
-          - jruby-9.4.3.0
-          - jruby-9.2.14.0
-          - truffleruby-23.0.0
-          - truffleruby-22.1.0
+          - "3"
+          - "3.2"
+          - "3.1"
+          - "3.0"
+          - "2.7"
+          - "2.6"
+          - "2.5"
+          - "2.4"
+          - "2.3"
+          - "jruby-9.4.3.0"
+          - "jruby-9.2.14.0"
+          - "truffleruby-23.0.0"
+          - "truffleruby-22.1.0"
 
     steps:
       - uses: actions/checkout@v2