`prompt_password` can't print Chinese prompt properly

[Jordan-Haidee]

My test code is

use rpassword::prompt_password;

#[test]
fn test_prompt_password() {
    let passwd = prompt_password("请输入密码：").unwrap();
}

where the prompt is simplified Chinese. It should print given prompt:

"请输入密码：" 

if everything is ok. But now its output is messy code:

璇疯緭鍏ュ瘑鐮侊細

• I guess maybe this bug is caused by the default character encoding used in Microsoft Windows. In China, it defaults to be GBK.