.travis.yml in caravan-0.4.0 vs .travis.yml in caravan-0.5.0.alpha1

- old
+ new

@@ -1,8 +1,9 @@
 language: ruby
 cache: bundler
 rvm:
   - 2.3.0
+  - 2.4.0
 after_success:
   - CODECLIMATE_REPO_TOKEN=b72ccd136db6874a3d5dd842c50c1dc0933a1f49a02c55ce8567ec7311600af3 bundle exec codeclimate-test-reporter
 notifications:
   email: false
   slack: navyblue-team:ioO5diAGc5WUQVDKc5BH1UbE