rdf in gutenberg_rdf-1.0.1

- old
+ new

@@ -1,7 +1,9 @@
 #!/usr/bin/env ruby
 
+warn "NOTE: the 'rdf' command is deprecated; use 'gutenberg_rdf' instead. It will be removed on or after 2020-07-01."
+
 $LOAD_PATH << File.expand_path(File.dirname(__FILE__) + '/../lib')
 
 require "gutenberg_rdf"
 
 unless ARGV.last && File.exist?(ARGV.last)
@@ -17,10 +19,10 @@
 puts "     Type: #{rdf.type}"
 puts "    Title: #{rdf.title}"
 puts " Subtitle: #{rdf.subtitle}"
 puts "  Authors: #{rdf.authors.join(', ')}"
 puts "Published: #{rdf.published}"
-puts " Language: #{rdf.language}"
+puts "Languages: #{rdf.languages.join(', ')}"
 puts "   Rights: #{rdf.rights}"
 puts "Bookcover: #{rdf.covers.first}"
 puts "   eBooks: \n#{rdf.ebooks.map{|b| "           #{b.uri}" }.join("\n")}"
 puts " Subjects: \n           #{rdf.subjects.join("\n           ")}"