Adds a struct to Bankster.Bic

[warmwaffles]

• Uses regex named capture to extract the data.
• Handles 8-11 BIC values.
• Adds a to_string/2 function for pretty output.
• Defines the String.Chars protocol for Bic.

[warmwaffles]

IF this is acceptable, I was thinking about potentially adding some structure components to IBAN and BBAN as well.

[warmwaffles]

@railsmechanic I've implemented the feedback. Changed from new to parse and added a parse! function.

[railsmechanic]

Many thanks for your PR. 👍

[warmwaffles]

Now to see if I can extract the information from the iban numbers 😄

[railsmechanic]

Now to see if I can extract the information from the iban numbers.

Please give me short reminder whether it works, then'll wait with the release of a new version 0.5.0

[warmwaffles]

It's gonna be a bit, I got yanked into a different direction and will come back to this.