Brazilcep

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- Added API Correios (via Correios site) support
- Added OpenCEP support

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- Updated copyright and Python version

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- Updated `pyproject.toml` to align with Python documentation standards
- Improved Nox tests and dependency environments
- Added support for Python 3.12

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- Added timeout settings
- Added proxy settings (https://github.com/mstuttgart/brazilcep/issues/40)
- Added real tests for APICEP and ViaCEP
- Updated documentation and README
- Deprecated Correios webservice support

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- Added timeout parameters for requests
- Fixed typos in README

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- Renamed library to BrazilCEP
- Created a new pip package
- Dropped support for Python 3.5, 3.6, and 3.7
- Added support for Python 3.9, 3.10, and 3.11
- Introduced Poetry for dependency management
- Added matrix testing for Python versions using Nox
- Improved documentation and code quality
- Fixed GitHub Actions lint and coverage issues
- Enhanced lint and coverage tests
- Created a documentation site (translated to English)
- Updated contribution guide to use Poetry