.travis.yml in optimize-js-1.0 vs .travis.yml in optimize-js-1.0.1

@@ -1,16 +1,22 @@
 language: ruby
 
 rvm:
+  - 2.0.0
+  - 2.1.10
+  - 2.2.5
   - 2.3.1
 
 cache: bundler
 
-branches:
-  only:
-    - master
+gemfile:
+  - gemfiles/rails_3.gemfile
+  - gemfiles/rails_4_with_sprockets_2.gemfile
+  - gemfiles/rails_4_with_sprockets_3.gemfile
+  - gemfiles/rails_5.gemfile
 
-env:
-  - RAKE_ENV=test
-
-script:
-  - bundle exec rake test
+matrix:
+  exclude:
+  - rvm: 2.0.0
+    gemfile: gemfiles/rails_5.gemfile
+  - rvm: 2.1.10
+    gemfile: gemfiles/rails_5.gemfile