roundrobin 0.1.0

A simple roundrobin implementation.
Documentation
# Roundrobin

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A weighted roundrobin implementation.

## Quick Start

```rust
fn main() {
    let url01 = "http://localhost:8081".to_string();
    let url02 = "http://localhost:8082".to_string();
    let server01 = Server::new(url01.clone(), 1);
    let mut rr = WeightedRoundRobinBalancer::new();
    rr.insert_server(server01); // default weight 1
    rr.insert_url(url02.clone(), 2);
    println!("Server: {}", rr.next().unwrap());
}
```