Merge pull request rspec#171 from rspec/update_to_ruby_232

upgrade to ruby 2.3.2

Author: JonRowe

travis/.travis.yml

@@ -18,7 +18,7 @@ rvm:
   - 2.0.0
   - 2.1
   - 2.2.5
-  - 2.3.1
+  - 2.3.2
   - 2.4.0-preview1
   - ruby-head
   - ree