test.yml in redstream-0.4.1

- old
+ new

@@ -3,10 +3,10 @@
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ['2.5', '2.6', '2.7']
+        ruby: ['2.5', '2.6', '2.7', '3.0']
     services:
       redis:
         image: redis
         ports:
           - 6379:6379