Add a note about Rust 0.9 support.
Add a note about Rust 0.9 support.

Shraddha512/rust-http,Shraddha512/rust-http,chris-morgan/rust-http,servo/rust-http,Shraddha512/rust-http,chris-morgan/rust-http,servo/rust-http,servo/rust-http,Shraddha512/rust-http,servo/rust-http,Shraddha512/rust-http,chris-morgan/rust-http,chris-morgan/rust-http