def __init__(self, rules=[], separator=''):
        super(NestedRule, self).__init__()
        self.rules = list(rules)
        self.separator = separator
Updates the dictionary with a single header line.
dataset/ETHPy150Open mrjoes/flask-admin/flask_admin/form/rules.py/NestedRule.__init__--crossover with--dataset/ETHPy150Open toastdriven/itty/itty.py/HTTPHeaders.parse_line