Update [SACardCode](https://github.com/tailucas/investec-api-python/blob/master/investec_api_python/sa_card_code.py) implementation to full coverage of Investec Open API [SA Card Code](https://developer.investec.com/za/api-products/documentation/SA_Card_Code).
Update SACardCode implementation to full coverage of Investec Open API SA Card Code.