Django-guid

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**Features**

* Added a ``RETURN_HEADER`` setting, which will return the GUID as a header with the same name


**Improvements**

* Added a Django Rest Framework test and added DRF to the ``demoproj``

* Improved tests to also check for headers in the response

* Added tests for the new setting

* Added examples to ``README.rst`` and docs, to show how the log messages get formatted

* Added an API page to the docs

* Fixed the ``readthedocs`` menu bug

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**Improvements**

* Changed logging from f'strings' to %strings

* Pre-commit hooks added, including ``black`` and ``flake8``

* Added ``CONTRIBUTING.rst``

* Added github actions to push to ``PyPi`` with github tags

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**Features**

* Added a SKIP_CLEANUP setting

**Improvements**

* Improved all tests to be more verbose

* Improved the README with more information and a list of all the available settings

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**Improvements**

* Added tests written in `pytests`, 100% codecov

* Added Django2.2 and Django3 to github workflow as two steps

* Improved logging

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**Improvements**

* Removed the mandatory DJANGO_GUID settings in settings.py. Added an example project to demonstrate how to set the project up

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**Improvements**

* Workflow added, better docstrings, easier to read flow