Question: when did season 4 of peaky blinders come out
[{'answer': '15 November 2017', 'provenance': [{'wikipedia_id': '38432808', 'title': 'Peaky Blinders (TV series)', 'start_paragraph_id': 3, 'start_character': 291, 'end_paragraph_id': 3, 'end_character': 307, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]