Merge branch 'f-xml-attrib-node-converter' into 'dev'

CHANGELOG.md

src/caoscrawler/cfood-schema.yml

src/caoscrawler/converters/xml_converter.py

src/caoscrawler/crawl.py

src/caoscrawler/default_converters.yml

unittests/test_converters.py

unittests/test_xml_converter.py