Question: when did the uefa cup change to the europa league
[{'answer': 'the 2009 -- 10 season'}, {'provenance': [{'wikipedia_id': '232175', 'title': 'UEFA Europa League', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 306, 'bleu_score': 0.8923575006167591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11544959301743817272}, 'section': 'Section::::Abstract.'}]}]