Question: when did the colt 45s become the astros
[{'answer': '1965', 'provenance': [{'wikipedia_id': '13894', 'title': 'Houston Astros', 'start_paragraph_id': 16, 'start_character': 685, 'end_paragraph_id': 16, 'end_character': 689, 'bleu_score': 1.0, 'section': 'Section::::Franchise history.:1962–1964: The Colt .45s.\n'}]}]