.travis.yml in kitchen-docker-2.5.0 vs .travis.yml in kitchen-docker-2.6.0.rc.0

@@ -1,17 +1,22 @@
 sudo: required
 dist: trusty
 language: ruby
 
 rvm:
-- "2.1"
-- "2.2"
-- "2.3"
+- "2.1.9"
+- "2.2.5"
+- "2.3.1"
 
 services:
 - docker
 
+cache:
+  bundler: true
+  directories:
+  - /var/lib/docker
+
 script:
-- docker version
-- kitchen --version
-- rake spec
-- kitchen test -d always
+- bundle exec docker version
+- bundle exec kitchen --version
+- bundle exec rake spec
+- bundle exec kitchen test -d always