.travis.yml in angelo-0.5.0 vs .travis.yml in angelo-0.5.1

@@ -1,6 +1,7 @@
 sudo: false
 language: ruby
 rvm:
-  - "2.2.4"
-  - "2.3.0"
-script: rake
+  - "2.2.8"
+  - "2.3.5"
+  - "2.4.2"
+script: bundle exec rake