Lib-shopware6-api-base

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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

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2022-06-01: update github actions test matrix

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2022-04-12: retry the request (experimental, but not harmful at all) if failed.
- issue https://github.com/bitranox/lib_shopware6_api/issues/1
- sometimes (seldom, after about 10 minutes connected) we got: "error code: 9, status: 401
The resource owner or authorization server denied the request, detail: Access token could not be verified."
- it seems to work when retry the request

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2022-03-29: remedy mypy Untyped decorator makes function "cli_info" untyped

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2022-02-15: documentation update