.travis.yml in sidekiq-cron-0.5.1 vs .travis.yml in sidekiq-cron-0.6.0

@@ -1,9 +1,7 @@
 language: ruby
 rvm:
-  - jruby-19mode
-  - rbx-19mode
-  - 2.0.0
+  - 2.3.1
   - 2.2.2
 services:
   - redis-server
 branches:
   only: