Question: when did the last apple update come out
[{'answer': 'August 7 , 2018'}, {'provenance': [{'wikipedia_id': '18195583', 'title': 'IOS version history', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 748, 'bleu_score': 0.7910696398462661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 333572878238653266}, 'section': 'Section::::Abstract.'}]}]