Update Rakefile.rb

Rakefile.rb

@@ -5,11 +5,16 @@ require 'rake/extensiontask'
 Rake::ExtensionTask.new('bsdcontrol.rb')
 task default: %w[clobber compile test]
 
-namespace :clang do
+namespace :format do
   desc 'Run clang-format'
-  task :format do
+  task :clang do
     sh 'clang-format -style=file:.clang-format -i ext/bsdcontrol.rb/*.c'
   end
+
+  desc 'Run rubocop'
+  task :ruby do
+    sh 'bundle exec rubocop -A'
+  end
 end
 
 namespace :test do