Set rubocop to check ruby target version 1.9

Author: tylerjl

.rubocop.yml

@@ -1,8 +1,10 @@
 AllCops:
-  TargetRubyVersion: 2.3
-
-Metrics/BlockLength:
-  Enabled: false
+  Exclude:
+    - pkg/**/*
+    - spec/fixtures/**/*
+  Include:
+    - Rakefile
+  TargetRubyVersion: 1.9
 
 Style/AndOr:
   Enabled: false
@@ -31,8 +33,5 @@ Style/MultilineBlockChain:
 Style/MultilineBlockLayout:
   Enabled: false
 
-Style/MultilineIfModifier:
-  Enabled: false
-
 Style/Not:
   Enabled: false

Gemfile

@@ -20,7 +20,8 @@ group :test do
   gem 'rspec-puppet-facts'
   gem 'rspec-puppet-utils'
   gem 'rspec-retry'
-  gem 'rubocop'
+  # Required to test against Ruby 1.9
+  gem 'rubocop', '~> 0.41.2'
   gem 'rubysl-securerandom'
   gem 'webmock'