allowed the Paystack::createCustomer() method to accept a data parameter

[theJohnCode]

This is needful because a customer sometimes are not created from the request data directly, so it is important if the data can be passed manually but it doesn't exist, it will fallback to the to the previous implementation

[gilbertozioma]

I wish they would merge this code because I recently had an issue with the first and last name of the customer not being passed. I had to query a different table in the database to fetch the names through the transaction ID.