.travis.yml in vagrant-unbundled-2.2.2.0 vs .travis.yml in vagrant-unbundled-2.2.3.0

@@ -11,9 +11,10 @@
 
 rvm:
   - 2.3.8
   - 2.4.5
   - 2.5.3
+  - 2.6.0
 
 branches:
   only:
     - master