.travis.yml in kitchen-docker-2.6.0 vs .travis.yml in kitchen-docker-2.7.0

@@ -1,12 +1,12 @@
 sudo: required
 dist: trusty
 language: ruby
 
 rvm:
-- "2.1.9"
-- "2.2.5"
 - "2.3.1"
+- "2.4.3"
+- "2.5.1"
 
 services:
 - docker
 
 cache: