Rakefile in jwt_keeper-3.2.0 vs Rakefile in jwt_keeper-3.3.0

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec) do |t|
   t.rspec_opts = '--format documentation'