Kalendar

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Fixed
~~~~~

- Addition now correctly calculates the new year on the boundary for dekad and pentad

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Added
~~~~~

- Pentad class

Fixed
~~~~~

- ``CONTRIBUTING.rst`` broken links repaired

Changed
~~~~~~~

- Use fixed `requirements.txt` file for development

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Removed
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- Python 3.7 support

Changed
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- Directory structure to use ``src`` folder
- Fixed testing to include coverage
- Published to PyPi

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Added
~~~~~

- Dekad module
- Package setup structure
- Unit tests
- Pre-commit hooks: black, flake8, mypy plus others
- Sphinx documentation