.travis.yml in onebox-1.8.27 vs .travis.yml in onebox-1.8.28

@@ -1,11 +1,13 @@
 language: ruby
+sudo: false
 rvm:
   - 2.2
   - 2.3
   - 2.4
 notifications:
   email:
     on_success: change
     on_failure: change
 script:
   - bundle exec rubocop
+  - bundle exec rspec