Update links

Author: atouchet

CONTRIBUTING.md

@@ -38,9 +38,9 @@ With that in mind, the steps for adding a new API are:
 
 ### Test before you commit
 
-We have two automated tests running on [Travis](https://travis-ci.org/rust-lang/libc):
+We have two automated tests running on [Travis](https://travis-ci.com/rust-lang/libc):
 
-1. [`libc-test`](https://github.com/alexcrichton/ctest)
+1. [`libc-test`](https://github.com/gnzlbg/ctest)
   - `cd libc-test && cargo test`
   - Use the `skip_*()` functions in `build.rs` if you really need a workaround.
 2. Style checker