Rakefile in kitabu-2.1.0 vs Rakefile in kitabu-3.0.0

@@ -1,5 +1,12 @@
+# frozen_string_literal: true
+
 require "bundler"
 Bundler::GemHelper.install_tasks
 
 require "rspec/core/rake_task"
 RSpec::Core::RakeTask.new
+
+require "rubocop/rake_task"
+RuboCop::RakeTask.new
+
+task default: %i[spec rubocop]