Unable to get article details

[codesalatdev]

Picnic changed the structure of the data the server returns. As a result, users are currently unable to fetch article details.

Integration tests show this failure:

FAILED integration_tests/test_client.py::test_get_article - KeyError: 'markdown'
FAILED integration_tests/test_client.py::test_get_article_with_category_name - KeyError: 'markdown'
FAILED integration_tests/test_client.py::test_get_article_by_gtin - KeyError: 'markdown'

A fix is on its way and will land with 2.x.x in the next couple of days.

[codesalatdev]

Fixed with #49