Add a comment to the given issue key. Accepts a body argument to be used
    as the comment's body.

def addcomment(accountable, body):
    """
    Add a comment to the given issue key. Accepts a body argument to be used
    as the comment's body.
    """

    r = accountable.issue_add_comment(body)
    headers = sorted(['author_name', 'body', 'updated'])
    rows = [[v for k, v in sorted(r.items()) if k in headers]]
    rows.insert(0, headers)
    print_table(SingleTable(rows))