code_to_flag behaves weirdly with lowercase country codes

[juliuste]

Hey 🙂 Thank you very much for providing this useful library! I noticed some unintuitive behaviour in the code_to_flag function, when supplying a country code in lowercase:

let correct = country_emoji::code_to_flag("DE"); // as_bytes returns [240, 159, 135, 169, 240, 159, 135, 170]
let incorrect = country_emoji::code_to_flag("de"); // as_bytes returns [240, 159, 136, 137, 240, 159, 136, 138]

I guess this happens because code_to_flag, unlike most other functions, doesn't use .to_uppercase() to normalize the input.

Expected behaviour

I'd either expect all methods to return None for lowercase codes, or the code_to_flag function to return the correct flag even when supplying a lowercase country code.

I'm happy to work on a fix for the problem if you don't have the time, but I'd need to know which behaviour you'd prefer.

[leodutra]

This should be fixed now on 0.2.0. The next version will include minimal testing.

[leodutra]

I'll close it, for now. Feel free to reopen if you have any issues.