config.yml in rubocop-rake-0.6.0

- old
+ new

@@ -6,20 +6,10 @@
     - run: bundle install
     - run: bundle exec rake
 
 jobs:
 
-  ruby-2.3:
-    docker:
-      - image: circleci/ruby:2.3
-    <<: *steps
-
-  ruby-2.4:
-    docker:
-      - image: circleci/ruby:2.4
-    <<: *steps
-
   ruby-2.5:
     docker:
       - image: circleci/ruby:2.5
     <<: *steps
 
@@ -31,20 +21,24 @@
   ruby-2.7:
     docker:
       - image: circleci/ruby:2.7
     <<: *steps
 
+  ruby-3.0:
+    docker:
+      - image: circleci/ruby:3.0
+    <<: *steps
+
   ruby-head:
     docker:
       - image: rubocophq/circleci-ruby-snapshot:latest
     <<: *steps
 
 workflows:
   version: 2
   build:
     jobs:
-      - ruby-2.3
-      - ruby-2.4
       - ruby-2.5
       - ruby-2.6
       - ruby-2.7
+      - ruby-3.0
       - ruby-head