Changelog:
* Change token for unnamed chord from `???` to `<unknown>` so it doesn't look like a glitch
* Add strategy for recognizing chords: squeeze everything into a single octave
* Chords found using this strategy will have lower priority when selecting a canonical chord name
* Improve strategy for selecting the best chord name
On PyPI: https://pypi.org/project/jchord/0.2.0/