pipa 0.3.0

Pipe Operator Library for Rust
Documentation 
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# pipa

Pipe Operator Library for Rust.

Features:
- Pipe things into chain of functions.
- Support different types.
- Support pipe for `Try`-able types(Option & Result)
- Support pipe for async-await with `Try`-able types(Option & Result)

Example:
```rust
fn f(a: i32) -> u64 {
    (a + 1) as u64
}

fn g(a: u64) -> String {
    (a + 1).to_string()
}

fn h(s: String) -> u64 {
    let ret = s.parse::<u64>();
    ret.unwrap() + 10
}

#[test]
fn pipe() {
    let ret = pipa!(123 => f => g => h);
    assert_eq!(135, ret);
}
```

More examples are in `tests/test.rs`.