Julia: update the list of people to ping

Author: StefanKarpinski

user/languages/julia.md

@@ -16,7 +16,7 @@ This guide covers build environment and configuration topics specific to
 Travis CI support for Julia is contributed by the community and may be removed
 or altered at any time. If you run into any problems, please report them in the
 [Travis CI issue tracker](https://github.com/travis-ci/travis-ci/issues/new?labels=julia)
-and cc `@tkelman @ninjin @staticfloat @simonbyrne`.
+and cc `@ararslan @staticfloat @StefanKarpinski`.
 
 ## Choosing Julia versions to test against