Try Ruby 2.3 with latest rvm.

djanowski · djanowski · commit 31919c20b9e7 · 2016-11-23T23:52:00.000-03:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,9 @@ language: ruby
 
 script: make test
 
+before_install:
+  - rvm get stable
+
 rvm:
   - 2.1
   - 2.2
