.travis.yml in voucherify-2.4.0 vs .travis.yml in voucherify-3.0.0

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.0.0
+  - 2.2.0
 before_install:
   - gem update bundler
 install: 
   - bundle install
 script: