Question: when did fortnite battle royale come out pc
[{'answer': 'September 2017', 'provenance': [{'wikipedia_id': '57813623', 'title': 'Fortnite', 'start_paragraph_id': 15, 'start_character': 440, 'end_paragraph_id': 15, 'end_character': 454, 'bleu_score': 1.0, 'section': 'Section::::Development.:"Fortnite Battle Royale".\n'}]}]