.travis.yml in mutant-0.5.16 vs .travis.yml in mutant-0.5.17

@@ -4,13 +4,13 @@
   - TRAVIS=true
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.1
-  - rbx
+  - rbx-2
 matrix:
   allow_failures:
-    - rvm: rbx
+    - rvm: rbx-2
 notifications:
   irc:
     channels:
       - irc.freenode.org#mutant
     on_success: never