Add frozen_string_literal magic header

lib/wicked_pdf.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # wkhtml2pdf Ruby interface
 # http://wkhtmltopdf.org/
 

lib/wicked_pdf/binary.rb

@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 class WickedPdf
   class Binary
-    EXE_NAME = 'wkhtmltopdf'.freeze
+    EXE_NAME = 'wkhtmltopdf'
 
     attr_reader :path, :default_version
 

lib/wicked_pdf/middleware.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
   class Middleware
     def initialize(app, options = {}, conditions = {})

lib/wicked_pdf/option_parser.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
   class OptionParser
     BINARY_VERSION_WITHOUT_DASHES = Gem::Version.new('0.12.0')

lib/wicked_pdf/pdf_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
   module PdfHelper
     def self.prepended(base)

lib/wicked_pdf/progress.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
   module Progress
     require 'pty' if RbConfig::CONFIG['target_os'] !~ /mswin|mingw/ && RUBY_ENGINE != 'truffleruby' # no support for windows and truffleruby

lib/wicked_pdf/railtie.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'wicked_pdf/pdf_helper'
 require 'wicked_pdf/wicked_pdf_helper'
 require 'wicked_pdf/wicked_pdf_helper/assets'

lib/wicked_pdf/tempfile.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'tempfile'
 require 'stringio'
 

lib/wicked_pdf/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
-  VERSION = '2.8.2'.freeze
+  VERSION = '2.8.1'
 end

lib/wicked_pdf/wicked_pdf_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WickedPdf
   module WickedPdfHelper
     def self.root_path

lib/wicked_pdf/wicked_pdf_helper/assets.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'net/http'
 require 'delegate'
 require 'stringio'