.travis.yml in nori-2.3.0 vs .travis.yml in nori-2.4.0

@@ -1,13 +1,9 @@
 # https://github.com/travis-ci/travis-ci/wiki/.travis.yml-options
 language: "ruby"
 script: "bundle exec rake"
 rvm:
-  - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0
-  - jruby-18mode
   - jruby-19mode
-  - rbx-18mode
-  - rbx-19mode
-  - ree
+  - rbx