ci.yml in asciidoctor-fb2-0.3.1

- old
+ new

@@ -15,11 +15,10 @@
       - name: Lint
         run: bundle exec rake lint
   test:
     strategy:
       matrix:
-        # ruby: [jruby, 2.4, 2.5, 2.6, 2.7]
-        ruby: [2.4, 2.5, 2.6, 2.7]
+        ruby: [jruby, 2.4, 2.5, 2.6, 2.7]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2