ci.yml in ii_policy-2.1.0

- old
+ new
@@ -2,24 +2,32 @@
 
 on: [push, pull_request]
 
 jobs:
   test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, 3.0]
-        gemfile: ['rails50', 'rails51', 'rails52', 'rails60', 'rails61']
+        ruby: [2.3, 2.4, 2.5, 2.6, 2.7, '3.0']
+        gemfile: ['rails50', 'rails51', 'rails52', 'rails60', 'rails61', 'rails70']
         exclude:
           - ruby: 2.3
             gemfile: rails60
           - ruby: 2.3
             gemfile: rails61
+          - ruby: 2.3
+            gemfile: rails70
           - ruby: 2.4
             gemfile: rails60
           - ruby: 2.4
             gemfile: rails61
+          - ruby: 2.4
+            gemfile: rails70
+          - ruby: 2.5
+            gemfile: rails70
+          - ruby: 2.6
+            gemfile: rails70
           - ruby: 3.0
             gemfile: rails50
           - ruby: 3.0
             gemfile: rails51
           - ruby: 3.0