start DEV 0.0.15

src/covid19/blueprints/common/common_model.py

src/covid19/blueprints/europe/europe_model.py

src/covid19/blueprints/rki/rki_model.py

src/covid19/blueprints/vaccination/vaccination_model.py

...ovid19/blueprints/vaccination/vaccination_model_import.py

...id19/blueprints/vaccination/vaccination_service_update.py

src/covid19/blueprints/who/who_model.py