Run Black (Python code formatter) only on Git unstaged/untracked files

• Python 3.6 (f-strings!)
• Click

Usage: kuro.py [OPTIONS]

Options:
  --diff             Create a diff of the changes, in a 'kuro.diff' file. If
                     you approve the changes, run kuro with --apply_diff.
  --apply_diff       Consume (and delete) an existing 'kuro.diff' file.
  --project_options  Setup options for Kuro/Black on a directory level.
  --help             Show this message and exit.

If you so desire, you can set a different Kuro/Black configuration on a global level by exporting an environment variable called KURO_BLACK_OPTIONS.

Kuro will prioritize using project options over using global options.

If no global or local options are set, Kuro will just run Black normally.

• Validation of Black settings saved on .kuro_config file
• Fix applying patch file (slightly broken at the moment)
• Creating a setup.py file to actually install this tool locally
• PIP? Maybe.