Question: when did strabger things season 1 come out
[{'answer': 'July 15 , 2016', 'provenance': [{'wikipedia_id': '46301800', 'title': 'Stranger Things', 'start_paragraph_id': 54, 'start_character': 103, 'end_paragraph_id': 54, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Release.\n'}]}]