bin/ridgepole in ridgepole-0.7.8 vs bin/ridgepole in ridgepole-0.8.0.rc1

@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
-# frozen_string_literal: true
-
 $LOAD_PATH << File.expand_path('../lib', __dir__)
 require 'yaml'
 require 'optparse'
 require 'fileutils'
 require 'ridgepole'
@@ -10,12 +8,12 @@
 
 $stdout.sync = true
 $stderr.sync = true
 
 Version = Ridgepole::VERSION
-DEFAULT_FILENAME = 'Schemafile'
+DEFAULT_FILENAME = 'Schemafile'.freeze
 
-MAGIC_COMMENT = <<-RUBY
+MAGIC_COMMENT = <<-RUBY.freeze
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 RUBY
 
 COLUMN_TYPES = {