Nuban update

[laurentlr]

Hello,
Here's the Nuban update, it now has 6 digits CBN !!

Here's the new bank code/CBN rule:

For DMBs:
ABCDEF is the 3-digit Financial Institution code assigned by the CBN, with 3 leading zeros e.g. ‘011’ and ‘232’ become ‘000011’ and ‘000232’ respectively;
For OFIs:
ABCDEF is the 5-digit Financial Institution code assigned by the CBN with a
leading ‘9’ e.g. ‘50547’ becomes ‘950547’;

For example Kuda Bank CBN is 50211

[mojoblanco]

Thanks a lot for this update. Hoping to see PRs coming in for the update soon.