Libranet-logging

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- Nothing changed yet.

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- Fix logo. [WVH]

- Add .gitlab-ci.yml [WVH]

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- Fix error ``ModuleNotFoundError: No module named 'libranet_logging.version'``. [WVH]

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- Move ``__version__``-attribute to ``__init__``. [WVH]

- Package ``libranet_logging`` forked from WVH's unreleased package. [WVH]

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- Add docstrings and type-hinting.

- Fix a series of issues reported by pylint.

- Change function-signature of ``libranet_logging.yaml.read_yml``: change ``vars`` into ``variables``
to avoid shadowing the buitlin ``vars()``-function::

>>> config = read_yaml(path, vars=None)
>>> config = read_yaml(path, variables=None)

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- Add ``version.py`` with a ``__version__``-attribute, rework version-management.

- In ``setup.py`` set minimum-requirements for cerberus >=1.3.1. [WVH]