.travis.yml in pdd-0.20.5 vs .travis.yml in pdd-0.20.6

@@ -1,13 +1,13 @@
 language: ruby
 rvm:
-  - 2.2.2
+  - 2.3.0
 cache: bundler
 branches:
   only:
     - master
 install:
   - travis_retry bundle update
 script:
-  - rake
+  - bundle exec rake
 after_success:
   - "bash <(curl -s https://codecov.io/bash)"