4.0.0

• Database and messages extracted to separate projects
  sokil/php-isocodes-db-i18n and
  sokil/php-isocodes-db-only. Current library may
  be used directly only if manual update of files required.
  See installation notes for more info.
• ./bin/update_iso_codes_db.sh signature changed to {mode} {base_dir} [{build_dir}].
  See installation notes for more info.