Remove the `#![feature(io_safety)]` from lib.rs.
Remove the `#![feature(io_safety)]` from lib.rs.

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust