Test with Ruby 2.4

Author: rafaelfranca

.travis.yml

@@ -9,6 +9,7 @@ rvm:
   - 2.1
   - 2.2.5
   - 2.3.1
+  - 2.4.0
   - ruby-head
   - jruby-19mode
   - rbx
@@ -39,6 +40,16 @@ matrix:
       gemfile: gemfiles/rails_5_0.gemfile
     - rvm: rbx
       gemfile: gemfiles/rails_5_0.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_3_0.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_3_1.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_3_2.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_4_0.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_4_1.gemfile
 
 notifications:
   email: false