dotenv_config 0.2.3

parse `env` to config struct for Rust
Documentation 
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use dotenv_config::EnvConfig;
use dotenvy::dotenv;

#[derive(Debug, EnvConfig)]
struct Config {
    #[env_config(name = "CONF_SERVER_ADDR", default = "192.168.2.1")]
    server_addr: String,
    server_mode: bool,
    #[env_config(name = "CONF_ENABLE", default = true)]
    enable: bool,
    #[env_config(name = "CONF_NUMBER", default = 123456)]
    num: Option<i64>,
    rr: Redis,
}

#[derive(Debug, EnvConfig)]
struct Redis {
    addr: String,
    port: String,
    auth: String,
    #[env_config(name = "CONF_REDIS_TIMEOUT", default = 30)]
    timeout: i32,
}

fn main() {
    dotenv().ok();
    let cfg = Config::init().expect("config init error");
    println!("{:#?}", cfg);
    assert!(cfg.server_addr == "192.168.2.1");
    assert!(!cfg.server_mode);
    assert!(!cfg.enable);
    assert!(cfg.num == Some(88888));
    assert!(cfg.rr.addr.is_empty());
    assert!(cfg.rr.port.is_empty());
    assert!(cfg.rr.auth.is_empty());
    assert!(cfg.rr.timeout == 30i32);
}