Merge pull request #18 from kakubin/action_ruby_version

tweak

Author: kakubin

.github/workflows/main.yml

@@ -14,12 +14,12 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '2.6.10'
-          - '2.7.6'
-          - '3.0.4'
-          - '3.1.2'
-          - '3.2.2'
-          - '3.3.0'
+          - '2.6'
+          - '2.7'
+          - '3.0'
+          - '3.1'
+          - '3.2'
+          - '3.3'
 
     steps:
     - uses: actions/checkout@v2