Rakefile in attr_keyring-0.5.2 vs Rakefile in attr_keyring-0.5.3

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
 require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
   t.libs << "test"