New Features:
- Last.fm fallback source 74
- Cover art and booklet downloads are skipped if it already exists 72
- If the `-u` option is mistakenly used for last.fm urls, a help message will show
- A `composer` key is now available for folder format templates
- (Internal) Everything is now documented
- (Internal) Line length is limited to 79 characters
Bug Fixes:
- Tidal albums not available in FLAC no longer break 75
- Soundcloud searches for last.fm are now working