Question: when did fortnite battle royal come out on xbox
[{'answer': 'September 2017'}, {'provenance': [{'wikipedia_id': '57813623', 'title': 'Fortnite', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9478022192843206185}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56819881', 'title': 'Fortnite Battle Royale', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'start_character': 198, 'end_paragraph_id': 1, 'end_character': 320, 'bleu_score': 1.0}]}]