Turn on and fix rubocop Style/FrozenStringLiteralComment.

Author: hainesr

.rubocop.yml

@@ -17,10 +17,6 @@ Lint/UselessAccessModifier:
 Style/PreferredHashMethods:
   EnforcedStyle: verbose
 
-# Turn this off for now.
-Style/FrozenStringLiteralComment:
-  Enabled: false
-
 # Enforce empty lines at the beginning of classes.
 Layout/EmptyLinesAroundClassBody:
   EnforcedStyle: beginning_only

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

bin/console

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'bundler/setup'
 require 'cff'

cff.gemspec

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

lib/cff.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

lib/cff/entity.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

lib/cff/file.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -32,7 +34,7 @@ class File
     # if not, use a single string.
     attr_accessor :comment
 
-    YAML_HEADER = "---\n".freeze # :nodoc:
+    YAML_HEADER = "---\n" # :nodoc:
     CFF_COMMENT = [
       "This CITATION.cff file was created by ruby-cff (v #{CFF::VERSION}).",
       'Gem: https://rubygems.org/gems/cff',

lib/cff/model.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -51,7 +53,7 @@ class Model < ModelPart
 
     # The default message to use if none is explicitly set.
     DEFAULT_MESSAGE = 'If you use this software in your work, please cite ' \
-      'it using the following metadata'.freeze
+      'it using the following metadata'
 
     # :call-seq:
     #   new(title) -> Model

lib/cff/model_part.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (c) 2018 Robert Haines.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");