.travis.yml in dry-initializer-rails-1.0.0 vs .travis.yml in dry-initializer-rails-2.0.0

@@ -6,11 +6,11 @@
 bundler_args: --without benchmarks tools
 script:
   - bundle exec rake
   - bundle exec rubocop
 rvm:
-  - 2.2.2
   - 2.3.0
+  - 2.4.0
   - ruby-head
 matrix:
   allow_failures:
     - rvm: ruby-head