Bump requirements codestyle

What's Changed

• Update isort requirement from ==5.4.* to ==5.5.* by @dependabot in #40
• Bump black from 19.10b0 to 20.8b1 by @dependabot in #39
• Bump actions/setup-python from v2.1.2 to v2.1.4 by @dependabot in #45
• Bump mypy from 0.782 to 0.790 by @dependabot in #44
• Update pytest requirement from ==6.0.* to ==6.2.* by @dependabot in #50
• Bump actions/setup-python from v2.1.4 to v2.2.1 by @dependabot in #51
• Update isort requirement from ==5.5.* to ==5.7.* by @dependabot in #52
• Update pytest-cov requirement from ==2.10.* to ==2.11.* by @dependabot in #53
• Bump pydantic from 1.6.1 to 1.8.2 by @dependabot in #63
• Bump codecov/codecov-action from 1 to 2.1.0 by @dependabot in #80
• Update flake8 requirement from ==3.8.* to ==4.0.* by @dependabot in #81
• Update isort requirement from ==5.7.* to ==5.10.* by @dependabot in #82
• ⬆️ upgrade pydantic and black by @LuisBrime in #119

Full Changelog: 1.2.4...1.2.5