build on ruby 2.3 too

Charlie Somerville · Charlie Somerville · commit 1dca9622b224 · 2016-09-20T19:26:10.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,3 +5,4 @@ rvm:
   - 2.0
   - 2.1
   - 2.2
+  - 2.3

-Original file line number
+Diff line change
   - 2.0
   - 2.1
   - 2.2
 +  - 2.3