Question: when did the echo dot 2 come out
[{'answer': 'October 20 , 2016', 'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 47, 'start_character': 65, 'end_paragraph_id': 47, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Variants.:Echo Dot.\n'}]}, {'provenance': [{'wikipedia_id': '44331153', 'title': 'Amazon Echo', 'start_paragraph_id': 47, 'start_character': 0, 'end_paragraph_id': 47, 'end_character': 392, 'bleu_score': 0.8321508300350711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18011961657152718686}, 'section': 'Section::::Variants.:Echo Dot.\n'}]}]