ruby.yml in zerobounce-0.3.0

- old
+ new

@@ -19,10 +19,10 @@
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ '2.5', '2.6', '2.7', '3.0' ]
+        ruby-version: ['2.6', '2.7', '3.0' ]
 
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1