Test with Chef 12.x

Since support for Chef 11.x was dropped, testing should not still rely on it.

Author: shortdudey123

.travis.yml

@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- 2.1.0
+- 2.3.1
 bundler_args: --without integration
 gemfile:
   - Gemfile

Gemfile

@@ -9,6 +9,6 @@ group :integration do
 end
 
 group :test do
-  gem 'chef', '11.10'
+  gem 'chef', '~> 12.14'
   gem 'rspec', '~> 3.1'
 end