pipeline.rb in html-pipeline-2.11.1

- old
+ new

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 require 'nokogiri'
 require 'active_support/xml_mini/nokogiri' # convert Documents to hashes
 
 module HTML
   # GitHub HTML processing filters and utilities. This module includes a small