The vim plugin takes now into consideration the `target-version` value of
the `pyproject.toml` file.

You can also specify a default target version with the configuration
variable `g:black_target_version`.

Vim's `:Black` command accepts now the following optional arguments:

- `line_length`
- `string_normalization`
- `black_target_version`

Those allow you to override any settings that come either from vim's
configuration or the `pyproject.toml` file.

It also supports supports a simple tab completion to allow to pass the
arguments quicky.

I didn't realize that it was a boolan value.

in the command line

to make CI happy

if no target verison is found