.travis.yml in angelo-0.4.1 vs .travis.yml in angelo-0.5.0

@@ -1,10 +1,6 @@
 sudo: false
 language: ruby
 rvm:
-  - "2.1.5"
-  - "2.2.0"
-  - "rbx-2"
+  - "2.2.4"
+  - "2.3.0"
 script: rake
-matrix:
-  allow_failures:
-    - rvm: rbx-2