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Auto merge of #26 - filsmick:string-ref, r=killercup

use &str instead of &String everywhere

It's a small change, but makes the code cleaner.

AFAIK `&String` is strictly inferior to `&str`; it's less flexible, for no real benefits.

[`clippy` even warns against &String](https://github.com/Manishearth/rust-clippy/wiki#ptr_arg).

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