Attempt to switch jruby into 2.0 mode

Author: flori

.travis.yml

@@ -15,14 +15,13 @@ rvm:
   - 2.2
   - 2.3.0
   - ree
-  - rbx-2
-  - jruby-18mode
-  - jruby-19mode
   - ruby-head
 matrix:
+  include:
+    - rvm: jruby
+      env: JRUBY_OPTS="--2.0"
   allow_failures:
     - rvm: rbx-2
     - rvm: ruby-head
 script: "bundle exec rake"
-
 sudo: false