.travis.yml in europeana-blacklight-0.4.6 vs .travis.yml in europeana-blacklight-0.4.7

@@ -1,6 +1,9 @@
 language: ruby
 rvm:
   - 2.2.1
+  - 2.3.1
 notifications:
   email: false
 sudo: false
+cache:
+  bundler: true