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

@@ -1,10 +1,15 @@
+before_install:
+  - gem install bundler
+
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.0
   - 2.1.5
   - 2.2.0
+  - 2.2.4
+  - 2.3.0
 
 script: "bundle exec rake spec"
 
 notifications:
   disabled: false