ci.yml in restpack_serializer-0.6.14

- old
+ new

@@ -16,10 +16,11 @@
           - 2.3
           - 2.4
           - 2.5
           - 2.6
           - 2.7
-          - 3.0
+          - "3.0"
+          - 3.1
 
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
       with: