.travis.yml in fluent-plugin-string-scrub-0.1.0 vs .travis.yml in fluent-plugin-string-scrub-1.0.0

@@ -1,8 +1,15 @@
 language: ruby
+script: bundle exec rake
+sudo: false
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.*
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5.2
+
+  #- ruby-head
 gemfile:
   - Gemfile
-  - Gemfile.fluentd.lt.0.12
+before_install:
+  - gem update bundler