.travis.yml in 3scale_client-2.3.3 vs .travis.yml in 3scale_client-2.3.4

@@ -1,6 +1,5 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - jruby
-  - rbx-19mode
+  - '1.9.3'
+  - '2.0.0'
+  - 'jruby'