.travis.yml in sym-2.6.2 vs .travis.yml in sym-2.6.3

- old
+ new

@@ -1,13 +1,15 @@
 language: ruby
+cache: bundler
 env:
-- CODECLIMATE_REPO_TOKEN=c71874cc22acffe1e2543d3388d3a96c73a65f0cfe17169dadd8de4a6c062c39
+- CODECLIMATE_REPO_TOKEN=c71874cc22acffe1e2543d3388d3a96c73a65f0cfe17169dadd8de4a6c062c39 TEST_DRB=true
 services:
 - memcached
 rvm:
-- 2.4.0
+- 2.2.6
 - 2.3.3
-script: rake
+- 2.4.0
+- jruby-9.1.7.0
 notifications:
   email:
     recipients:
     - kigster@gmail.com
     on_success: change