xactor 0.5.0

Xactor is a rust actors framework based on async-std
Documentation
# Xactor is a rust actors framework based on async-std

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## Documentation

* [GitHub repository]https://github.com/sunli829/xactor
* [Cargo package]https://crates.io/crates/xactor
* Minimum supported Rust version: 1.39 or later

## Features

* Async actors.
* Actor communication in a local context.
* Using Futures for asynchronous message handling.
* Typed messages (No `Any` type). Generic messages are allowed.

## Examples

```rust
use xactor::*;

#[message(result = "String")]
struct ToUppercase(String);

struct MyActor;

impl Actor for MyActor {}

#[async_trait::async_trait]
impl Handler<ToUppercase> for MyActor {
    async fn handle(&mut self, _ctx: &Context<Self>, msg: ToUppercase) -> String {
        msg.0.to_uppercase()
    }
}

#[async_std::main]
async fn main() -> Result<()> {
    // Start actor and get its address
    let mut addr = MyActor.start().await;

    // Send message `ToUppercase` to actor via addr
    let res = addr.call(ToUppercase("lowercase".to_string())).await?;
    assert_eq!(res, "LOWERCASE");
    Ok(())
}
```

## Performance

**Actix vs. Xactor**

|        |Wait for response|Send only|
|--------|-----------------|---------|
|Actix   |          1548 ms|    14 ms|
|Xactor  |           930 ms|    30 ms|

[GitHub repository](https://github.com/sunli829/xactor-benchmarks)

## References

* [Actix]https://github.com/actix/actix
* [Async-std]https://github.com/async-rs/async-std