Rakefile in rmagick-3.0.0 vs Rakefile in rmagick-3.1.0

- old
+ new

@@ -188,9 +188,9 @@
 task spec: :compile
 
 if ENV['STYLE_CHECKS']
   require 'rubocop/rake_task'
   RuboCop::RakeTask.new
-  task default: %i[spec test rubocop]
+  task default: %i[rubocop]
 else
   task default: %i[spec test]
 end