v1.8.6

• Lingo::Attendee::VectorFilter learned pos option to print position and
  byte offset with each word.
• Lingo::Attendee::VectorFilter learned tfidf option to sort results based
  on their tf–idf score; the document
  frequencies are calculated over the "corpus" of all files processed during
  a single program invocation.
• Lingo::Attendee::VectorFilter learned tokens option to filter on
  Lingo::Language::Token in addition to Lingo::Language::Word.
• Lingo::Attendee::VectorFilter no longer supports debug (as well as
  prompt and preamble); use Lingo::Attendee::DebugFilter instead.
• Lingo::Attendee::TextReader no longer removes line endings; option chomp
  is obsolete.
• Lingo::Attendee::TextReader passes byte offset to the following attendee.
• Lingo::Attendee::Tokenizer records token's byte offset.
• Lingo::Attendee::Tokenizer records token's sequence position.
• Lingo::Attendee::Tokenizer learned skip-tags option to skip over
  specified tags' contents.
• Lingo::Attendee subclasses warn when invalid or obsolete options or names
  are used.
• Changed German infix substitution /en to ch/chen in order to prevent
  overly aggressive identifications.
• Internal refactoring and API changes.