.travis.yml in fernet-1.5 vs .travis.yml in fernet-1.6

@@ -3,9 +3,7 @@
 rvm:
   - "1.9.3"
   - "1.9.2"
   - rbx-19mode
   - "1.8.7"
-  - jruby-18mode
-  - jruby-19mode
 
 script: bundle exec rspec -b spec