.travis.yml in i18n-js-3.0.1 vs .travis.yml in i18n-js-3.0.2

@@ -4,22 +4,23 @@
 language: ruby
 cache:
   - bundler
 rvm:
   - 2.1.10
-  - 2.2.5
+  - 2.2.8
   # Since the Travis Build Env does not recognize `2.3` alias yet
   # We need to specify the version precisely
-  - 2.3.3
-  - 2.4.0
+  - 2.3.5
+  - 2.4.2
   - ruby-head
 before_install:
 # Need to install something extra to test JS
 - npm install
 gemfile:
   - gemfiles/i18n_0_6.gemfile
   - gemfiles/i18n_0_7.gemfile
   - gemfiles/i18n_0_8.gemfile
+  - gemfiles/i18n_0_9.gemfile
 matrix:
   fast_finish: true
   allow_failures:
     - rvm: ruby-head