.travis.yml in tram-policy-0.3.1 vs .travis.yml in tram-policy-0.4.0

@@ -2,10 +2,11 @@
 language: ruby
 sudo: false
 cache: bundler
 bundler_args: --without benchmarks tools
 script:
-  - bundle exec rake spec
+  - bundle exec rake
+  - bundle exec rubocop
 rvm:
   - 2.3.0
   - 2.4.0
   - ruby-head
   - jruby-9.1.0.0