Bump to 0.3.4

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "gcc"
-version = "0.3.3"
+version = "0.3.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/alexcrichton/gcc-rs"

src/lib.rs

@@ -43,7 +43,6 @@
 //! ```
 
 #![doc(html_root_url = "http://alexcrichton.com/gcc-rs")]
-#![feature(convert)]
 #![cfg_attr(test, deny(warnings))]
 
 use std::env;