zip 2.3.0

Library to support the reading and writing of zip files.
Documentation 
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use std::env::var;

fn main() {
    if var("CARGO_FEATURE_DEFLATE_MINIZ").is_ok() && var("CARGO_FEATURE__ALL_FEATURES").is_err() {
        println!("cargo:warning=Feature `deflate-miniz` is deprecated; replace it with `deflate`");
    }
}