Merge branch 'main' of github.com:thomaswoehlke/covid19python into main

covid19/__init__.py

covid19/oodm/__init__.py

covid19/oodm/admin/__init__.py

covid19/oodm/admin/admin_service.py

covid19/oodm/common/__init__.py

covid19/oodm/common/common_model.py

covid19/oodm/common/common_model_transient.py

covid19/oodm/common/common_service.py

covid19/oodm/europe/__init__.py

covid19/oodm/europe/europe_model.py

covid19/oodm/europe/europe_service.py

covid19/oodm/europe/europe_service_download.py

covid19/oodm/europe/europe_service_import.py

covid19/oodm/europe/europe_service_update.py

covid19/oodm/nrw/__init__.py

covid19/oodm/rki/__init__.py

covid19/oodm/rki/rki_model.py

covid19/oodm/rki/rki_service.py

covid19/oodm/rki/rki_service_download.py

covid19/oodm/rki/rki_service_import.py