Rakefile in jekyll-commonmark-1.1.0 vs Rakefile in jekyll-commonmark-1.2.0

@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 require "bundler/gem_tasks"
-require 'rspec/core/rake_task'
+require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
 task :default => :spec