Question: who wrote skinny love bon iver and birdy
[{'answer': 'Justin Vernon', 'provenance': [{'wikipedia_id': '31726391', 'title': 'Skinny Love', 'start_paragraph_id': 1, 'start_character': 68, 'end_paragraph_id': 1, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31726391', 'title': 'Skinny Love', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 0.940033794885305, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8836186224343625182}, 'section': 'Section::::Abstract.'}]}]