v1.9.0

• Dropped support for Ruby 1.9.
• Removed support for deprecated options and attendee names (old → new):
  • Lingo::Language::Grammar:
    compositum → compound
  • Lingo::Attendee::TextReader:
    lir-record-pattern → records
  • Lingo::Config:
    multiworder → multi_worder,
    objectfilter → object_filter,
    textreader → text_reader,
    textwriter → text_writer,
    vectorfilter → vector_filter,
    wordsearcher → word_searcher
• Lingo::Attendee::TextWriter learned format directives for ext option (currently supported are: %c = config name, %l = language name, %d = current date, %t = current time).
• Lingo::Attendee::Sequencer remembers word form of sequences.
• Updated and extended English system dictionary and suffix list.
• Fixed errors with XML input (issue #15 by Thomas Berger).