.travis.yml in sidekiq-throttled-0.4.0 vs .travis.yml in sidekiq-throttled-0.4.1

@@ -2,9 +2,10 @@
 rvm:
   - 2.0
   - 2.1
   - 2.2
   - 2.3.0
+  - 2.3.1
   - ruby-head
   - jruby-9.0.0.0
   - jruby-9.0.1.0
   - jruby-head
   - ruby-head