qr_code 2.0.0

QR code encoder in Rust, support structured append (data in multiple qrcodes)
Documentation 
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#[cfg(feature = "bmp")]
fn main() {
    let qr_code = qr_code::QrCode::new(b"Hello").unwrap();
    let bmp = qr_code.to_bmp();
    bmp.write(std::fs::File::create("test_data/test.bmp").unwrap())
        .unwrap();
}