Test more rubies

Author: jhawthorn

.github/workflows/main.yml renamed to .github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Ruby
+name: Test
 
 on:
   push:
@@ -14,6 +14,8 @@ jobs:
     strategy:
       matrix:
         ruby:
+          - '2.7.0'
+          - '3.0.0'
           - '3.1.0'
 
     steps: