Improve CodeClimate config

Author: n-rodriguez

.codeclimate.yml

@@ -1,26 +1,8 @@
 ---
-engines:
-  duplication:
-    enabled: true
-    config:
-      languages:
-      - ruby
-      - javascript
-      - python
-      - php
-  fixme:
-    enabled: true
+plugins:
   rubocop:
     enabled: true
-ratings:
-  paths:
-  - "**.inc"
-  - "**.js"
-  - "**.jsx"
-  - "**.module"
-  - "**.php"
-  - "**.py"
-  - "**.rb"
-exclude_paths:
-- spec/
-- lib/generators/rails/templates/
+    channel: rubocop-1-31-0
+exclude_patterns:
+  - spec/
+  - lib/generators/rails/templates/

ajax-datatables-rails.gemspec

@@ -35,8 +35,8 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'generator_spec'
   s.add_development_dependency 'guard-rspec'
   s.add_development_dependency 'pg'
-  s.add_development_dependency 'puma'
   s.add_development_dependency 'pry'
+  s.add_development_dependency 'puma'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rspec-retry'