Merge pull request #1114 from rubocop-hq/ci-with-ruby-3.0

Run CI with Ruby 3.0 too

Author: pirj

.circleci/config.yml

@@ -61,7 +61,7 @@ jobs:
           key: bundle-v2-{{ checksum "Gemfile.lock" }}
           paths:
             - vendor/bundle
-      - run: rake internal_investigation spec
+      - run: bundle exec rake internal_investigation spec
 
   code-climate:
     docker:
@@ -95,12 +95,12 @@ workflows:
           requires: [confirm_config_and_documentation]
           matrix:
             parameters:
-              ruby: ['2.4', '2.5', '2.6', '2.7']
+              ruby: ['2.4', '2.5', '2.6', '2.7', '3.0']
       - rubocop:
           requires: [confirm_config_and_documentation]
           matrix:
             parameters:
-              ruby: ['2.4', '2.5', '2.6', '2.7']
+              ruby: ['2.4', '2.5', '2.6', '2.7', '3.0']
       - edge-rubocop:
           requires: [confirm_config_and_documentation]
       - jruby