s/servo/rust-lang-nursery/ in README.md
s/servo/rust-lang-nursery/ in README.md

Missed the most important part of the last commit... r=me
rust-lang/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen