Implement serde::Serialize and serde::Deserialize

[hdoordt]

Thanks for making this! I wanted to add support for serde, so:

Implement serde::Serialize and serde::Deserialize via FromStr impl and Iban::as_str

[codecov]

Codecov Report

Merging #6 (5c9fc85) into main (7003ed5) will decrease coverage by 2.18%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   95.37%   93.19%   -2.18%     
==========================================
  Files           2        2              
  Lines         389      397       +8     
  Branches      389      397       +8     
==========================================
- Hits          371      370       -1     
- Misses          6       13       +7     
- Partials       12       14       +2     

Files	Coverage Δ
src/lib.rs	92.12% <0.00%> (-2.52%)	⬇️

... and 1 file with indirect coverage changes

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[JohnPeel]

Your solution doesn't work in no-std, and we could take advantage of arrayvec's serde feature to simplify the change.

[JohnPeel]

Implemented in 77affba

Though it doesn't support hyphenated Ibans yet. Using from_str in a custom deserializer (or using derive) is a better idea.

Still working out how I want to support multiple serialization formats.