Question: when will the 2018 nhl schedule be released
[{'answer': 'released on June 21', 'provenance': [{'wikipedia_id': '55632970', 'title': '2018–19 NHL season', 'start_paragraph_id': 33, 'start_character': 236, 'end_paragraph_id': 33, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Regular season.\n'}]}]