format codes

Rakefile

@@ -1,14 +1,16 @@
-require "bundler/gem_tasks"
-require "rake/extensiontask"
+# frozen_string_literal: true
+
+require 'bundler/gem_tasks'
+require 'rake/extensiontask'
 
 task :scream do
-    puts "みくは自分を曲げないよ！"
+  puts 'みくは自分を曲げないよ！'
 end
 
-task :build => :compile
+task build: :compile
 
 Rake::ExtensionTask.new('decoders/native') do |ext|
-    ext.lib_dir = 'lib/mikunyan'
+  ext.lib_dir = 'lib/mikunyan'
 end
 
-task :default => [:clobber, :compile, :spec]
+task default: %i[clobber compile spec]