Question: when does star trek discovery season 2 air
[{'answer': '2019', 'provenance': [{'wikipedia_id': '55359922', 'title': 'Star Trek: Discovery (season 2)', 'start_paragraph_id': 3, 'start_character': 64, 'end_paragraph_id': 3, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]