Segno

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* Fixed man page directory. This issue was introduced by mistake in the

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* Fixed release notes / aligned changelog to the mistake of skipping two minor
releases

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* Fixed packaging: include man page, source distribution did not
contain all relevant files such as docs and test suite.
* Moved man page to the correct directory
* Fixed PDF creation: `PR 144 <https://github.com/heuer/segno/pull/144>`_
and `PR 145 <https://github.com/heuer/segno/pull/145>`_
provided by `Mathias Winkel <https://github.com/dasmy>`_
* Merged `PR 143 <https://github.com/heuer/segno/pull/143>`_ (typo in docs)
provided by `Marek Madejski <https://github.com/TrangOul>`_

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* Switched from setuptools to flit for setup
* Updated test suite to work with musl based distributions

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* Dropped Python 2.7 support
* Removed dependency on ``pkg_resources``. Segno uses ``importlib.metadata``
to provide plugins. For Python versions < 3.10 this introduces a dependency
on ``importlib-metadata``.