.travis.yml in ec2spec-0.1.1 vs .travis.yml in ec2spec-0.1.2

@@ -1,5 +1,12 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.3.5
-before_install: gem install bundler -v 1.16.1
+  - 2.3.0
+  - 2.4.0
+  - 2.5.0
+before_install: 
+  - gem install bundler -v 1.16.1
+  - gem install rubocop
+script:
+  - rubocop --fail-level=W
+  - bundle exec rspec