Rakefile in iri-0.5.1 vs Rakefile in iri-0.6.0

@@ -1,8 +1,8 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2019-2021 Yegor Bugayenko
+# Copyright (c) 2019-2023 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
 # in the Software without restriction, including without limitation the rights
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
@@ -32,11 +32,11 @@
 
 def version
   Gem::Specification.load(Dir['*.gemspec'].first).version
 end
 
-task default: %i[clean test rubocop]
+task default: %i[clean test rubocop copyright]
 
 require 'rake/testtask'
 Rake::TestTask.new do |test|
   test.libs << 'lib' << 'test'
   test.pattern = 'test/**/test_*.rb'
@@ -52,6 +52,14 @@
 
 require 'rubocop/rake_task'
 RuboCop::RakeTask.new do |task|
   task.fail_on_error = true
   task.requires << 'rubocop-rspec'
+end
+
+task :copyright do
+  sh "grep -q -r '#{Date.today.strftime('%Y')}' \
+    --include '*.rb' \
+    --include '*.txt' \
+    --include 'Rakefile' \
+    ."
 end