Question: when did the first season of stranger things start filming
[{'answer': 'November 2015', 'provenance': [{'wikipedia_id': '46301800', 'title': 'Stranger Things', 'start_paragraph_id': 44, 'start_character': 159, 'end_paragraph_id': 44, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Production.:Filming.\n'}]}, {'provenance': [{'wikipedia_id': '46301800', 'title': 'Stranger Things', 'start_paragraph_id': 45, 'start_character': 4, 'end_paragraph_id': 45, 'end_character': 1000, 'bleu_score': 0.9549028375745491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4837631353783966626}, 'section': 'Section::::Production.:Filming.\n'}]}]