.travis.yml in gon-4.1.1 vs .travis.yml in gon-5.0.0

@@ -3,9 +3,11 @@
   - 1.9.2
   - 1.9.3
   - 2.0.0
   - jruby-18mode # JRuby in 1.8 mode
   - jruby-19mode # JRuby in 1.9 mode
-  - rbx-18mode
-  - rbx-19mode
+  - rbx
+matrix:
+  allow_failures:
+    - rvm: rbx
 # uncomment this line if your project needs to run something other than `rake`:
 # script: bundle exec rspec spec