ci.yml in diffend-0.2.45

- old
+ new

@@ -17,9 +17,10 @@
           - '2.5'
           - 'jruby-9.2.14.0'
         bundler:
           - '2.1.4'
           - '2.2.7'
+          - '2.2.17'
         include:
           - ruby: '2.7'
             coverage: 'true'
 
     steps: