.travis.yml in strong_migrations-0.1.4 vs .travis.yml in strong_migrations-0.1.5

@@ -1,7 +1,7 @@
 language: ruby
 rvm:
-  - 2.2
+  - 2.3.1
 gemfile:
   - Gemfile
   - test/gemfiles/activerecord32.gemfile
   - test/gemfiles/activerecord40.gemfile
   - test/gemfiles/activerecord41.gemfile