ci.yml in ii_policy-2.2.0

- old
+ new

@@ -6,11 +6,11 @@
   test:
     runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0']
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1]
         gemfile: ['rails50', 'rails51', 'rails52', 'rails60', 'rails61', 'rails70']
         exclude:
           - ruby: 2.3
             gemfile: rails60
           - ruby: 2.3
@@ -30,9 +30,15 @@
           - ruby: 3.0
             gemfile: rails50
           - ruby: 3.0
             gemfile: rails51
           - ruby: 3.0
+            gemfile: rails52
+          - ruby: 3.1
+            gemfile: rails50
+          - ruby: 3.1
+            gemfile: rails51
+          - ruby: 3.1
             gemfile: rails52
 
     name: ruby ${{ matrix.ruby }}, ${{ matrix.gemfile }}
 
     env: