config.yml in rubocop-minitest-0.12.0

- old
+ new

@@ -37,12 +37,9 @@
 workflows:
   build:
     jobs:
       - documentation-checks
       - rake_default:
-          name: Ruby 2.4
-          image: circleci/ruby:2.4
-      - rake_default:
           name: Ruby 2.5
           image: circleci/ruby:2.5
       - rake_default:
           name: Ruby 2.6
           image: circleci/ruby:2.6