Pyscaffoldext-custom-extension

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- Update dependencies to include ConfigUpdater 3.x

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- Update configupdater to version >= 2.0

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- Ensure generated extension is tested in combination with ``--namespace``, 24

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- Changes required for PyScaffold v4.0
- Updated templates for testing
- Simplified templates package thanks to ``pyscaffold.templates.get_template``
- Removed unnecessary ``coding: utf-8`` comments
- Replaced ``travis`` with ``cirrus`` extension
- Version scheme changed to ``no-guess-dev`` (from ``setuptools_scm``)
- Fixed references to PyScaffold in the docs, by adding it as a doc requirement, 23
- Added Github Actions template for automatically publishing tags to PyPI

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- Add ``pyscaffoldext`` by default warning the user

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- Cosmetic changes