.travis.yml in gibbon-2.2.4 vs .travis.yml in gibbon-2.2.5

@@ -2,7 +2,7 @@
 sudo: false
 cache: bundler
 rvm:
   - 2.0.0
   - 2.1.5
-  - 2.2.0
-  - rbx-2
+  - 2.2.2
+  - 2.3.3
\ No newline at end of file