log4rs 1.4.0

A highly configurable multi-output logging implementation for the `log` facade
Documentation 
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use log::{error, info, warn, LevelFilter};
use log4rs::{
    append::console::ConsoleAppender,
    config::{Appender, Root},
    encode::json::JsonEncoder,
};

fn main() {
    let stdout: ConsoleAppender = ConsoleAppender::builder()
        .encoder(Box::new(JsonEncoder::new()))
        .build();
    let log_config = log4rs::config::Config::builder()
        .appender(Appender::builder().build("stdout", Box::new(stdout)))
        .build(Root::builder().appender("stdout").build(LevelFilter::Info))
        .unwrap();
    log4rs::init_config(log_config).unwrap();

    info!("Info log!");
    warn!("Warn log with value {}", "test");
    error!("ERROR!");
}