Question: when did season 6 of voltron come out
[{'answer': 'June 15 , 2018', 'provenance': [{'wikipedia_id': '49375739', 'title': 'Voltron: Legendary Defender', 'start_paragraph_id': 25, 'start_character': 30, 'end_paragraph_id': 25, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}, {'provenance': [{'wikipedia_id': '49375739', 'title': 'Voltron: Legendary Defender', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 72, 'bleu_score': 0.850733133512352, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14603906120390112709}, 'section': 'Section::::Production.\n'}]}]