Question: when did twenty one pilots start the hiatus
[{'answer': 'July 2017', 'provenance': [{'wikipedia_id': '38337784', 'title': 'Twenty One Pilots', 'start_paragraph_id': 41, 'start_character': 409, 'end_paragraph_id': 41, 'end_character': 418, 'bleu_score': 1.0, 'section': 'Section::::History.:2015–2017: "Blurryface".\n'}]}, {'provenance': [{'wikipedia_id': '38337784', 'title': 'Twenty One Pilots', 'start_paragraph_id': 41, 'start_character': 0, 'end_paragraph_id': 41, 'end_character': 520, 'bleu_score': 0.978375183951072, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6942419190207595460}, 'section': 'Section::::History.:2015–2017: "Blurryface".\n'}]}]