[WooCommerce 3.0] make NZ region compulsory in checkout page

wc-req-nz.php

add_filter( 'woocommerce_billing_fields', 'woo_filter_state_billing', 10, 1 );
add_filter( 'woocommerce_shipping_fields', 'woo_filter_state_shipping', 10, 1 );

function woo_filter_state_billing( $address_fields ) { 
  $address_fields['billing_state']['required'] = true;
	return $address_fields;
}

function woo_filter_state_shipping( $address_fields ) { 
	$address_fields['shipping_state']['required'] = true;
	return $address_fields;
}
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//Make Region (State) required
function custom_nz_locale($locale){
  $locale['NZ']['state']['required'] = true;
  return $locale;
}
add_filter('woocommerce_get_country_locale', 'custom_nz_locale');