Update the README

Author: alexcrichton

README.md

@@ -695,5 +695,5 @@ additional terms or conditions.
 <!-- Badges -->
 [travis-build-status]: https://travis-ci.org/rust-lang-nursery/rustup.rs
 [travis-build-status-svg]: https://img.shields.io/travis/rust-lang-nursery/rustup.rs.svg
-[appveyor-build-status]: https://ci.appveyor.com/project/brson/rustup-rs
-[appveyor-build-status-svg]: https://img.shields.io/appveyor/ci/brson/rustup-rs.svg
+[appveyor-build-status]: https://ci.appveyor.com/project/rust-lang-libs/rustup-rs
+[appveyor-build-status-svg]: https://ci.appveyor.com/api/projects/status/ob64fa46mp25wp35?svg=true