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A client for NATS using `tokio` and async-await.
There are still features missing, but it should be ready for use in simple situations.
## Installation
```toml
[dependencies]
tokio-nats = "0.4.1"
```
## Usage
```rust
use tokio_nats::{NatsConfigBuilder, connect};
use futures_util::StreamExt;
async fn demo() {
    let config = NatsConfigBuilder::default()
        .server("127.0.0.1:4222")
        .build()
        .unwrap();
    let mut client = connect(config).await.unwrap();
    client.publish("MySubject", "hello world".as_bytes()).await.unwrap();
    client.subscribe("MyOtherSubject").await.unwrap().for_each(async move |message| {
        println!("Received message {:?}", message);
    }).await;
}
```