Question: when did fortnite battle royale mode come out
[{'answer': 'in 2017', 'provenance': [{'wikipedia_id': '57813623', 'title': 'Fortnite', 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '57813623', 'title': 'Fortnite', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 826, 'bleu_score': 0.593043131148278, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8824274952337307588}, 'section': 'Section::::Abstract.'}]}]