.travis.yml in shopify-sinatra-app-0.3.0 vs .travis.yml in shopify-sinatra-app-0.3.1

- old
+ new

@@ -1,8 +1,8 @@
 language: ruby
 
 rvm:
-  - 2.1.5
+  - 2.3.1
 
 gemfile: example/Gemfile
 
 script: "./test.sh"