Formatting: Add Black as a development dependency #366
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Added Black to the development packages list. It is added with the specific version, so it is installed even though it is a pre-release. Created a pyproject.toml configuration file for it. It is the only configuration format Black understands. Unfortunately Flake8 doesn’t support this configuration file yet, so .flake8 remains and the line length value is duplicated.
I configured it to be compatible only with Python 3.6, which we use. Line length is extended to 119 from a previous agreement. The suggested safe option is not present as it is a default.
This is a complement to pre-commit hooks (#331) that allows to run all the code cleaning stuff (#335) manually too.