.travis.yml in shopify-sinatra-app-0.3.4 vs .travis.yml in shopify-sinatra-app-0.4.0

- old
+ new

@@ -1,8 +1,8 @@
 language: ruby
 
 rvm:
-  - 2.3.3
+  - 2.5.0
 
 gemfile: example/Gemfile
 
 script: "./test.sh"