.travis.yml in trav3-0.2.1 vs .travis.yml in trav3-0.2.2

- old
+ new

@@ -15,8 +15,9 @@
   - ./cc-test-reporter before-build
 
 script:
   - bundle exec rake
   - bundle exec rubocop
+  - bundle exec yard | if grep warn; then exit 1; else exit 0; fi
 
 after_script:
   - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT