a user-friendly client for HKU Library
```rust use hkulibrary::{LibClient，Task};
async fn main() {
let client = LibClient::new();
let task = Task::new("2023-06-29","08300930","129");
client.login("username", "password")
.await.unwrap()
.book(&task)
.await.unwrap();
}
Task has a `From` implementation for `(&str, &str, &str)`, so you can also do
rust
use hkulibrary::LibClient;
async fn main() {
let client = LibClient::new();
client.login("username", "password")
.await.unwrap()
.book(&("2023-06-29","08300930","129").into())
.await.unwrap();
}
or
rust
use hkulibrary::LibClient;
async fn book() -> Result<(), Box