MAINT: JSONFileConverter can parse additonal valid JSON content

.gitignore

CHANGELOG.md

...ts/test_data/extroot/realworld_example/dataset_cfoods.yml

src/caoscrawler/converters.py

src/caoscrawler/crawl.py

src/caoscrawler/structure_elements.py

src/doc/how-to-upgrade.md

unittests/test_converters.py

unittests/test_directories/examples_json/jsontest_cfood.yml