.travis.yml in henkei-1.17.3 vs .travis.yml in henkei-1.17.4

@@ -2,26 +2,29 @@
   global:
     - CC_TEST_REPORTER_ID=bb96c1ff9dc66724c38fb4eb54486dd72dc88a7fd6e727c034b9cf8d747d069e
 
 language: ruby
 rvm:
-  - 1.9.3
-  - 2.0.0
   - 2.1.10
   - 2.2.7
   - 2.3.6
   - 2.4.3
   - 2.5.0
 
 before_install:
   - gem update bundler
 
+install:
+  - bundle install --jobs=3 --retry=3
+  - gem install rubocop
+
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - ./cc-test-reporter before-build
 
 script:
+  - rubocop
   - bundle exec rspec
 
 after_script:
   - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT