Rakefile in sensu-plugins-trello-0.2.3 vs Rakefile in sensu-plugins-trello-0.2.4

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
 
 RSpec::Core::RakeTask.new(:spec) do |r|