build fails on Windows and MacOS

[hanckmann]

It results (on MacOS) in the following error:

error[E0599]: no function or associated item named `new` found for struct `yauuid::Node` in the current scope
  --> src/main.rs:66:51
   |
66 |                          let node = yauuid::Node::new("lo");
   |                                                   ^^^ function or associated item not found in `yauuid::Node`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.

in my cargo.toml

[dependencies]
yauuid = "0.2.1"

I am not sure what is going on or how to fix this (I am quite new to Rust).
If you need more details or info... let me know.

[condy0919]

https://github.com/condy0919/uuid/blob/master/src/node.rs#L29-L30

It reads /sys directory to get the address of supplied interface. It's linux only now, but feel free to raise a PR to support MacOS and windows. :P