Conversor de moeda - 3o Aplicativo do curso https://www.udemy.com/course/curso-completo-flutter-app-android-ios/
Para fazer com que a API funcione será necessário gerar uma chave no seu usuário no site responsável pela API que estamos utilizando: https://hgbrasil.com/,
Após isso substitua a palavra chave no arquivo lib/main.dart pela chave gerada após o cadastro
const request = "https://api.hgbrasil.com/finance?format=json&key=chave";
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