.travis.yml in percy-capybara-2.3.3 vs .travis.yml in percy-capybara-2.3.4

@@ -1,10 +1,11 @@
 language: ruby
 sudo: false
 cache: bundler
 rvm:
-  - 1.9.3
-  - 2.2
+  - ruby-2.2.6
+  - ruby-2.3.3
+  - ruby-2.4.0
   - ruby-head
 matrix:
   allow_failures:
   - rvm: ruby-head
 before_install: