v2.0.0

Changes

• Allow importing and exporting multiple worlds at once
• Fix target worlds not being cleaned up during exporting with the --overwrite
  flag (#14)
• Add a pretty printer for haze list
• Rename --path flag to --minecraft-version and restrict setting its value
  to stable, preview, or education
• Allow setting COM_MOJANG environment variable to define an arbitrary
  com.mojang path
• Merge haze_core and haze into a single crate
• Add colored help message for haze help
• Support using comments in config.json
• Provide binaries for Linux and macOS