Merge pull request #561 from thedrow/patch-2

Added RBX to the build matrix

Author: Petr Chalupa

.travis.yml

@@ -14,6 +14,7 @@ rvm:
   - jruby-9.0.5.0
   - jruby-head
   - rbx-2
+  - rbx
 
 jdk:
   - oraclejdk8
@@ -34,6 +35,7 @@ matrix:
     - rvm: jruby-head
     - rvm: 1.9.3
     - rvm: rbx-2
+    - rvm: rbx
     - rvm: jruby-head
       jdk: oraclejdk8
       env: TRUFFLE=1