.travis.yml in disqus-for-jekyll-1.0.4 vs .travis.yml in disqus-for-jekyll-1.0.5

@@ -1,12 +1,15 @@
 sudo: false
 language: ruby
 
-before_install:
-  - gem update --system
+before_install: gem update --system
+before_script: bundle update
 
+script: script/cibuild
+
 matrix:
   include:
+    - rvm: 2.6.0-preview1
     - rvm: 2.5.0
     - rvm: 2.4.3
     - rvm: 2.3.6
     - rvm: 2.2.9