.travis.yml in yawast-0.2.0.beta2 vs .travis.yml in yawast-0.2.0.beta3

@@ -1,7 +1,8 @@
 language: ruby
 rvm:
   - 2.2.4
+  - 2.3.1
 notifications:
   email:
     on_success: never
     on_failure: never