Use Rubocop in development

Rakefile

@@ -1,9 +1,16 @@
+# frozen_string_literal: true
 require 'bundler/gem_tasks'
 
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:spec)
 task default: :spec
 
+require 'rubocop/rake_task'
+RuboCop::RakeTask.new do |task|
+  task.requires << 'rubocop-rspec'
+end
+task default: :rubocop
+
 require 'yard'
 YARD::Rake::YardocTask.new(:doc)
 task default: :doc

bin/rubocop

@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+#
+# This file was generated by Bundler.
+#
+# The application 'rubocop' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rubocop", "rubocop")

xommelier.gemspec

@@ -26,10 +26,12 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'rspec', '~> 2.99.0'
   s.add_development_dependency 'rspec-its', '~> 1.0.1'
-  s.add_development_dependency 'rake', '~> 10.4.2'
+  s.add_development_dependency 'rake', '~> 11.2.2'
   s.add_development_dependency 'yard', '~> 0.8.7.6'
   s.add_development_dependency 'simplecov', '~> 0.6.1'
   s.add_development_dependency 'redcarpet', '>= 3.2.3'
+  s.add_development_dependency 'rubocop', '>= 0.41.1'
+  s.add_development_dependency 'rubocop-rspec'
   s.add_development_dependency 'pry'
   s.add_development_dependency 'pry-byebug'
   s.add_development_dependency 'byebug'