branches 0.2.1

Branch hinting prediction and control functions for stable Rust including likely, unlikely, assume and abort to help algorithm optimization
Documentation 
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use rustc_version::{version_meta, Channel};

fn main() {
    if let Ok(meta) = version_meta() {
        if meta.channel == Channel::Nightly {
            println!("cargo:rustc-cfg=unstable");
        }
    }
}