Question: how many episodes in season 2 of shadow hunters
[{'answer': '20', 'provenance': [{'wikipedia_id': '49784674', 'title': 'List of Shadowhunters episodes', 'start_paragraph_id': 1, 'start_character': 251, 'end_paragraph_id': 1, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]