Merge pull request #1270 from consul/upgrade-ruby

upgrade to ruby 2.3.2

.ruby-version

@@ -1 +1 @@
-2.3.1
+2.3.2

.travis.yml

@@ -2,7 +2,7 @@ language: ruby
 addons:
   postgresql: "9.4"
 rvm:
- - "2.2.3"
+ - "2.3.2"
 cache: bundler
 before_script:
   - "for i in config/*.example; do cp \"$i\" \"${i/.example}\"; done"