v0.1.1.0

• Add the bash completion to the nix derivation
• Make the pattern syntax more flexible
• Add disc number tag
• Add checks:
  • track numbers are sequential
  • all albums from an artist are of the same genre
  • check that the cover image size is between bounds
• Output stats at the end of the checks
• Add exceptions to the artist genre check
• Remove the files and directory subcommands
• Various minor refactoring and bug fixes

Full Changelog: v0.1.0.0...v0.1.1.0