restore config.treat_symbols_as_metadata_keys_with_true_values = true for rspec < 3
restore config.treat_symbols_as_metadata_keys_with_true_values = true for rspec < 3

This should be removed eventually - definitely before rspec-4 is out
(2020?).

consti/guard-rspec,mes/guard-rspec,guard/guard-rspec,baberthal/guard-rspec,kvokka/guard-rspec