.travis.yml in chef-vault-2.3.0 vs .travis.yml in chef-vault-2.4.0

- old
+ new

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - "1.9.3-p547"
-  - "2.0.0-p576"
-  - "2.1.3"
+  - "1.9.3-p551"
+  - "2.0.0-p598"
+  - "2.1.5"
 install: bundle install --binstubs
 env: TRAVIS_BUILD=true