moro 0.4.0

Experimental structured concurrency support for async Rust (similar to trio's nurseries)
Documentation 
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macro_rules! ready {
    ($e:expr) => {
        match $e {
            std::task::Poll::Ready(t) => t,
            std::task::Poll::Pending => {
                return std::task::Poll::Pending;
            }
        }
    };
}