Use rubcop:autocorrect task

Author: nobu

Gemfile

@@ -7,6 +7,6 @@ group :development do
   gem 'racc', '> 1.4.10'
   gem 'kpeg', github: 'evanphx/kpeg'
   gem 'test-unit'
-  gem 'rubocop'
+  gem 'rubocop', '>= 1.31.0'
   gem 'gettext'
 end

Rakefile

@@ -105,5 +105,5 @@ else
   RuboCop::RakeTask.new(:rubocop) do |t|
     t.options = [*parsed_files]
   end
-  task :build => [:generate, "rubocop:auto_correct"]
+  task :build => [:generate, "rubocop:autocorrect"]
 end