Add Ruby 2.3.3 to tested rubies

lord · lord · commit 4352bd9f0cef · 2017-02-23T21:50:02.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ language: ruby
 rvm:
   - 2.2.5
   - 2.3.1
+  - 2.3.3
 
 cache: bundler
 script: bundle exec middleman build
