Lib-shopware6-api

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2023-07-13:
- introduce PEP517 packaging standard
- introduce pyproject.toml build-system
- remove setup.cfg
- remove setup.py
- update black config
- clean ./tests/test_cli.py

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2023-06-28:
- introduce additional header fields
- update black config
- remove travis config
- remove bettercodehub config
- do not upload .egg files to pypi.org
- update github actions : checkoutv3 and setup-pythonv4
- remove "better code" badges
- remove python 3.6 tests
- adding python 3.11 tests
- update pypy tests to 3.9

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2022-07-04: support additional query parameters for patch, post ,put and delete requests

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2022-07-04: allow different content-types in order to be able to upload documents as octet-stream

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2022-06-30: specify correct "attr" version in requirements

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2022-06-02: update to github actions checkoutv3 and setup-pythonv3