ci.yml in graphql-batch-0.5.1

- old
+ new

@@ -8,11 +8,11 @@
   test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.4, 2.7, '3.0']
-        graphql_version: ['~> 1.10.0', '~> 1.13']
+        ruby: [2.4, 2.7, '3.1']
+        graphql_version: ['~> 1.10.0', '~> 1.13', '~> 2.0']
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true