Question: when does the mama mia sequel come out
[{'answer': 'July 20 , 2018', 'provenance': [{'wikipedia_id': '54535911', 'title': 'Mamma Mia! Here We Go Again', 'start_paragraph_id': 72, 'start_character': 46, 'end_paragraph_id': 72, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Release.\n'}]}]