Question: when did the amazon echo plus come out
[{'answer': '31 October 2017', 'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 62, 'start_character': 72, 'end_paragraph_id': 62, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Variants.:Echo Plus.\n'}]}, {'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 62, 'start_character': 0, 'end_paragraph_id': 62, 'end_character': 399, 'bleu_score': 0.8970855583859471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 322748559819844772}, 'section': 'Section::::Variants.:Echo Plus.\n'}]}]