move lint configuration (black, isort, mypy) to configuration files

[joshbode]

move lint configuration (black, isort, mypy) to configuration files (pyproject.toml, setup.cfg) to play nicer with other dev environemnts

[codecov]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #97   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines         770    770           
  Branches      142    142           
=====================================
  Hits          770    770

Impacted Files	Coverage Δ
datamodel_code_generator/parser/base.py	100% <ø> (ø)	⬆️
datamodel_code_generator/__main__.py	100% <ø> (ø)	⬆️
datamodel_code_generator/parser/jsonschema.py	100% <100%> (ø)	⬆️
datamodel_code_generator/model/base.py	100% <100%> (ø)	⬆️
datamodel_code_generator/format.py	100% <100%> (ø)	⬆️
datamodel_code_generator/parser/openapi.py	100% <100%> (ø)	⬆️

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[koxudaxi]

LGTM :)

[koxudaxi]

@joshbode
I have released new version include the PR as 0.4.0
Thank you very much