Question: when does new mama mia film come out
[{'answer': 'July 20 , 2018', 'provenance': [{'wikipedia_id': '8425661', 'title': 'Mamma Mia! (film)', 'start_paragraph_id': 78, 'start_character': 92, 'end_paragraph_id': 78, 'end_character': 106, 'bleu_score': 1.0, 'section': 'Section::::Sequel.\n'}]}]