.travis.yml in ikazuchi-1.0.0 vs .travis.yml in ikazuchi-1.0.1

@@ -1,9 +1,10 @@
 language: ruby
 sudo: false
 cache: bundler
 rvm:
-  - 2.2.5
-  - 2.3.1
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
 script:
   - bundle exec rubocop
   - bundle exec rake spec