Test against Ruby 2.3.3 on Travis CI

tricknotes · tricknotes · commit 787575f3290e · 2016-12-28T12:11:50.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,5 +6,6 @@ rvm:
   - 2.0.0
   - 2.1.5
   - 2.2.0
+  - 2.3.3
 notifications:
   email: false
