Broken in WooCommerce 3.2.0

After adding a product to the cart the following fatal PHP error is thrown. Might be time to say goodbye to this one:

Warning: Declaration of WC_Flat_Rate_Per_Country_State_Postcode::calculate_shipping($package) should be compatible with WC_Shipping_Method::calculate_shipping($package = Array) in /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php on line 43

Notice: Undefined property: WC_Flat_Rate_Per_Country_State_Postcode::$state_group_no in /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php on line 349

Notice: Undefined property: WC_Flat_Rate_Per_Country_State_Postcode::$state_group_no in /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php on line 349

Notice: Undefined property: WC_Flat_Rate_Per_Country_State_Postcode::$state_group_no in /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php on line 349

Notice: Undefined property: WC_Flat_Rate_Per_Country_State_Postcode::$state_group_no in /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php on line 349

Warning: Cannot modify header information - headers already sent by (output started at /home/choco/public_html/staging/wp-content/plugins/postcode-shipping/postcode_shipping.php:43) in /home/choco/public_html/staging/wp-includes/pluggable.php on line 1210