Merge pull request #52 from tricknotes/ruby-2.3

Test on Ruby 2.3.3 & 2.4.0

Author: bolandrm

.travis.yml

@@ -3,8 +3,8 @@ language: ruby
 bundler_args: "--binstubs --standalone --without documentation --path ../bundle"
 script: "bundle exec rake test"
 rvm:
-  - 2.0.0
-  - 2.1.5
   - 2.2.0
+  - 2.3.3
+  - 2.4.0
 notifications:
   email: false