tox.ini: Add 'reformat' environment
Run 'tox -e reformat' or 'make reformat' to reformat code using 'black'.
test-requirements.txt:
Removed linter requirements (moved into tox.ini)
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Run 'tox -e reformat' or 'make reformat' to reformat code using 'black'.
test-requirements.txt:
Removed linter requirements (moved into tox.ini)