ci.yml in restpack_serializer-0.6.15

- old
+ new

@@ -18,9 +18,10 @@
           - 2.5
           - 2.6
           - 2.7
           - "3.0"
           - 3.1
+          - 3.2
 
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1
       with: