.travis.yml in percy-cli-1.2.7 vs .travis.yml in percy-cli-1.2.8

@@ -1,6 +1,11 @@
 language: ruby
 rvm:
   - 2.1
   - 2.2
   - ruby-head
-script: bundle exec rspec
+before_install:
+  - gem update --system
+  - gem update bundler
+script:
+  - bundle exec rspec
+  - bundle exec rubocop -D