.travis.yml in mixlib-install-3.4.0 vs .travis.yml in mixlib-install-3.5.0

@@ -35,9 +35,11 @@
   - rvm: 2.2
   - rvm: 2.3
     env: SUITE=ubuntu
   - rvm: 2.3
     env: SUITE=windows-server
+  - rvm: 2.3
+    env: SUITE=centos
 
 before_script:
   - ci/before-script.sh
   # put terraform on PATH
   - export PATH="$PWD/bin:$PATH"