Merge pull request #491 from liamnaddell/master

Change redox-os link

README.md

@@ -187,7 +187,7 @@ See also [Games Made With Piston](https://github.com/PistonDevelopers/piston/wik
 
 See also [A comparison of operating systems written in Rust](https://github.com/flosse/rust-os-comparison).
 
-* [redox-os/redox](https://github.com/redox-os/redox) — [<img   src="https://api.travis-ci.org/redox-os/redox.svg?branch=master">](https://travis-ci.org/redox-os/redox)
+* [redox-os/redox](https://gitlab.redox-os.org/redox-os/redox) — [<img   src="https://api.travis-ci.org/redox-os/redox.svg?branch=master">](https://travis-ci.org/redox-os/redox)
 * [thepowersgang/rust_os](https://github.com/thepowersgang/rust_os) — [<img src="https://api.travis-ci.org/thepowersgang/rust_os.svg?branch=master">](https://travis-ci.org/thepowersgang/rust_os)
 * [tock/tock](https://github.com/tock/tock) — A secure embedded operating system for Cortex-M based microcontrollers
 * [nebulet/nebulet](https://github.com/nebulet/nebulet) — A microkernel that implements a WebAssembly "usermode" that runs in Ring 0.