Hi!

This looks like an awesome crate to use for colours. One question though: could a non-windows version of enable_ansi_support be added to the crate?

Ideally I'd rather not have my CLI applications having any OS-specific code - it would be nice if I could just stick ansi_term::enable_ansi_support() at the top of my main() function, and know that it'll do whatever's needed for the current OS.

It could just be literally #[cfg(not(windows))] fn enable_ansi_support() -> Result<(), u64> { Ok(()) }. If you'd be willing to add this, I can also submit a PR.