class RuboCop::ConfigObsoletion

def load_rules

Additional rules files can be added with `RuboCop::ConfigObsoletion.files << filename`
Default rules for obsoletions are in config/obsoletion.yml
def load_rules
  rules = self.class.files.each_with_object({}) do |filename, hash|
    hash.merge!(YAML.safe_load(File.read(filename))) do |_key, first, second|
      first.merge(second)
    end
  end
  cop_rules = rules.slice(*COP_RULE_CLASSES.keys)
  parameter_rules = rules.slice(*PARAMETER_RULE_CLASSES.keys)
  load_cop_rules(cop_rules).concat(load_parameter_rules(parameter_rules))
end