.travis.yml in rubysl-prettyprint-2.0.2 vs .travis.yml in rubysl-prettyprint-2.0.3

@@ -3,12 +3,12 @@
   - RUBYLIB=lib
   - RUBYLIB=
 script: mspec spec
 rvm:
   - 2.0.0
-  - rbx-2.1.1
+  - rbx-2.2.1
 matrix:
   exclude:
     - rvm: 2.0.0
       env: RUBYLIB=lib
-    - rvm: rbx-2.1.1
+    - rvm: rbx-2.2.1
       env: RUBYLIB=