v0.3.0

Major version bumped because the CLI interface changed a bit (due to porting the argument parsing to latest clap).

• New feature: export to CSV. See readme for details of the format.
• Nicer, colored log messages and errors.
• Now possible to customize the number of rayon worker threads used for scanning.
• Thanks to a fastanvil update, 1.12 and below worlds are now supported - but only vanilla ones.

Full Changelog: v0.2.3...v0.3.0