Rakefile in d_heap-0.2.1 vs Rakefile in d_heap-0.2.2

@@ -1,14 +1,20 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
 require "rake/extensiontask"
 
-task :build => :compile
+task build: :compile
 
 Rake::ExtensionTask.new("d_heap") do |ext|
   ext.lib_dir = "lib/d_heap"
 end
 
-task :default => [:clobber, :compile, :spec]
+task default: %i[clobber compile spec rubocop]