slack attachments reply

長文を折りたたんでbot投稿

@respond_to('^hoge$')
def members_command(message):

    attachments = [{
        'pretext': "pretext",
        'text': "hoge\n" * 30}]
    
    message.reply_webapi('', json.dumps(attachments), in_thread=True)

参考
https://www.pydoc.io/pypi/slackbot-0.5.3/autoapi/dispatcher/index.html