Question: when does season 4 of voltron legendary defenders come out
[{'answer': 'October 13 , 2017', 'provenance': [{'wikipedia_id': '49375739', 'title': 'Voltron: Legendary Defender', 'start_paragraph_id': 2, 'start_character': 581, 'end_paragraph_id': 2, 'end_character': 598, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49375739', 'title': 'Voltron: Legendary Defender', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 676, 'bleu_score': 0.7702529697731091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18313954643919152747}, 'section': 'Section::::Abstract.'}]}]